Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf783bcdeb9e0908…

MALICIOUS

PDF

88.3 KB Created: 2021-03-16 02:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a0bae7b9509db7d1d56bf8f4ca37071e SHA-1: 15a5b9bc5dcdde44401734307dc094cb26ab5cc7 SHA-256: cf783bcdeb9e090822f2e040df47c97cf1fd141abcd7c43ae23b319561601293
186 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 or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=star+wars+force+arena+mod+apk+android+1 PDF link annotation
    • http://helpcopyright-service.com/62476923046oeqtw.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/eyjehhd/schema_electrique_moteur_essuie_glace.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/lowrance_elite_7_hdi_ice_transducer.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/denotation_et_connotation.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/xpgenid/new_york_city_wallpaper_murals.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/01jedsb/36530235573.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/b0ijCje/zinumotemipi.pdfIn PDF document text
    • http://003-center.ru/how_to_use_fuzzy_lookup_add_in_excelr955o.pdfIn PDF document text
    • http://techanomic.com/crane_cool_mist_humidifier_stopped_working2s0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/kgdnggj/biggy_piggy_lyrics.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/joniva.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/Phhhgji/69832981383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/62933127762.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_b0b14b3d656840b4bf44118a875c3055.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daniwodug/azure_information_protection_viewer_rpmsg.pdfIn PDF document text
    • https://37d20dde-80dc-45a1-8224-77eeb5e9759a.filesusr.com/ugd/bcd086_cb0a71d52d0b4be2a988fa48dcc94047.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_3dfa95ed4d2f470a96f83af540d4a1a8.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 5580 bytes
SHA-256: dee8dd8d48282a35928a5acccf2cf1647d3ce0a457e4d170786f494fc45988dd
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16496 bytes
SHA-256: aabc1178624a947f80a38d8f8c55756a28d44fd6af3fecdbe4f50553d9f277d7
font_03_sfnt_off00013c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c