Malicious PDF — malware analysis report

Static analysis result for SHA-256 73908d73a8d94fcf…

MALICIOUS

PDF

97.8 KB Created: 2021-03-19 00:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0e6f51a590abc9e72724239b48716a81 SHA-1: 081b3d89a1916209e34f0c3f1874c61be1d9336e SHA-256: 73908d73a8d94fcf877cc8d742b2ac0988ac3e4bacf1acc3e197924b9e06b9e0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=aghori+mantra+book+pdf PDF link annotation
    • http://obzorov.site/47995400208dlgdw.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/92467362385.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/jfG5Zhc/75164412270.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/cgjzIge/iphone_11_assistive_touch_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/8hgzijF/rocketman_1997_trailer.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/college_botany_practical_book_download.pdfIn PDF document text
    • http://1ux.site/the_essentials_of_technical_communication_4th_ed_ebookb4zky.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/XjiH4E6/41587771201.pdfIn PDF document text
    • http://the-glow.ru/dungeons_and_dragons_5th_edition_players_handbook_download_freem1flg.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/mejobiwewupapixog2ti9h.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/1680247.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/ihnjajf/vulujazule.pdfIn PDF document text
    • http://nesakud.mypressonline.com/77589909626.pdfIn PDF document text
    • https://lideteli.weebly.com/uploads/1/3/0/7/130775407/noxoz_kofiwo_talivozifubarev_lajimulal.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/77274661611.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/fozujinaxuv.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/6f2ae3dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4d34cea5c23d4b8da1a30b1e659870f2.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_6846ad9471e04ce486c5a9d09113cd53.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_b5aa136117c8425ab74c7c355e0f6e79.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_93e40ddf604d4f5fa73d85eba0c113b6.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_30e644ce9ba347c0ab641c4a977399f2.pdf?index=trueIn PDF document text
    • http://setovoj.onlinewebshop.net/tecnologia_antigua_y_moderna.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_ddb409a4ab0645539c7036d6f086e9cf.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_d7eca47df55e4c67be6d3cb462f60e88.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 5440 bytes
SHA-256: 885fd2356fd57ca45a85a4bbdad6a7569c8ea9da33b64c5e1f48b8328071f8c8
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 12476 bytes
SHA-256: 5217dee12fffadb9c2da001f10b669e7705ca4084eab8548390ac4d206d20170
font_03_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_04_sfnt_off00015236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15236 11868 bytes
SHA-256: 24ba6500a321d0b433b8863decaf18838ef6731621415d54bbc026aa2f8dd9f5