Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bb0fe031bc9873…

MALICIOUS

PDF

80.7 KB Created: 2021-02-23 19:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 613ecb1e4cda5819cddc44982cb4acb2 SHA-1: 5440ed68d354f14b5511aa73682455557d419845 SHA-256: 62bb0fe031bc98738ee746a302caef53c785b98d1d903907fd76e0178c8138a4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard use of PDF for SEO purposes or to distribute links to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+use+mods+skyrim+xbox+one PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417827/normal_600b37f0759ed.pdfIn PDF document text
    • http://alania365.ru/nimawemureleduzativis82qmz.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/wixomogetusazemota9b0qx.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/bhh933G/54492351809.pdfIn PDF document text
    • http://successinyourlif.website/best_gun_phantom_forcesxi9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_6027e7581795f.pdfIn PDF document text
    • http://tehnotop.site/73149142561kqwr5.pdfIn PDF document text
    • http://tovelksa.website/viwekivabitudozuviwm2lpj.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/gjijnie/carnivores_dinosaur_hunter_hd_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/SHFMfAc/ben_10_alien_race_game_download_apk.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/joxapor.pdfIn PDF document text
    • http://fortuneo.best/guntur_district_weather_report_todayzcxhe.pdfIn PDF document text
    • http://siteznakomstv69.space/how_make_money_with_android_appsadupq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fdec304ac51c.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/hghVTi5/60640507440.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/6110918.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/hc33BmC/post_it_note_app_for_macbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwabofori.epizy.com/jelakukaxini.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 5156 bytes
SHA-256: fe419eef1bd3a5e07bdeb625a7e1ff0b659c1a74b9d013ee0859d2f5bd7fa1f3
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 11692 bytes
SHA-256: 72acce5bbff838f5a7fc1254d81671a287305a81911c4682d10de4cff3f676f5
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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