Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32df3350dfd9c49…

MALICIOUS

PDF

75.8 KB Created: 2021-02-14 17:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34553d2ad202373ff722b845435f1f8b SHA-1: 90e84ea3a4b44f58c595b50a6bf05ae39285b357 SHA-256: a32df3350dfd9c49f0b3ec8f3d6980075e0f47a0c4654cee43b8c30c519f33ea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/wix?keyword=among+the+impostors+pdf+weebly PDF link annotation
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/vagud.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/1470342.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/jJHi4ia/defender_carbon_monoxide_detector_ll6070.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/g12krt9/3806458601.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/8f4331de4aeefec.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/ihdAchg/lopapasepiwed.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gadW6P6/wifi_password_viewer_root_pro_apk.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/dapuziviv-lajegekij-xinuju-xaruzopelafitut.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/3605467.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/Hiehf6m/whipped_cream_frosting_decorating_cake.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/haid0Lb/bike_race_king_game_video.pdfIn PDF document text
    • https://futinubub.weebly.com/uploads/1/3/5/3/135328842/gakesawexaxi.pdfIn PDF document text
    • http://jujiwaneko.iblogger.org/powojizavatake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubumedi.rf.gd/automobile_spare_parts_shop_project_report.pdfIn PDF document text
    • http://wajiletum.epizy.com/former_ceo_of_popeyes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 5568 bytes
SHA-256: c2f09fec800b22979bfb5ee7fbee9fe47e00aa407f08773ef42529c7580711aa
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 10088 bytes
SHA-256: d4061f159e033758310a27ed259b0bd94f7632fb28642a06174c18cbb39f4406

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