Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca7cc1d213a107…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 18:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f381bdb3296a0af8a334c04e695cf2ee SHA-1: 536cf57c6069f383fe1328f14a51d64e5bf70ea3 SHA-256: a9ca7cc1d213a1078844c359bdc41e6d564d4bd496ba2f8de80d69ae64f76160
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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/strik?utm_term=imagen+de+carita+feliz+animada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fd37a1c93edb.pdfIn PDF document text
    • http://dubetones.22web.org/28839307628.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/ifhijfm/8203499417.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/N6jduNn/berserk_chapter_release_chart.pdfIn PDF document text
    • http://zunuvubono.22web.org/ableitungsregeln_bersicht.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/5gejdig/download_game_super_jump_soccer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_6058caddb1b29.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/rovuweraja/rasif.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_7c57bcceca994f609813aa0482c38d9c.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_f862e83ea66945b89d8ca41a50e0a9d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0be78f9-a28a-44ec-84cf-6c8871d45575/8538150641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7078a0-7771-47d9-8afa-cd091dbcd7ba/what_does_one_armed_man_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/67145176855.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/fundamentals_of_statistical_mechanics_and_thermal_physics_by_f_reif_free_download.pdfIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_861fde8ad12346a398d33ae955d0480c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58371a50-8238-4d8e-bb42-15e95e34c71e/69774499826.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/what_is_the_theme_of_georges_marvelous_medicine.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/95184841194.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_0874c9d59e6b4c3ab4b5c6ad72cb507b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 5148 bytes
SHA-256: d66eef7e2557b501e4026fe0690b36b0ac31da8041ff1680a2eff92491248051
font_01_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 11012 bytes
SHA-256: d1f25e49bd7df71a46776e5dffe0ddc481237c08bc8214584b937183022f7a52

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