Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b08bc07d21d6f0b…

MALICIOUS

PDF

106.2 KB Created: 2021-03-14 07:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e9c5d59545ceb0f725eda392efa3a48 SHA-1: df8d2c4fa3511b1485f7fa83c562e703384fcdda SHA-256: 7b08bc07d21d6f0b86eb5f4680b269c2b11bfc0e190359336d8b131b15e0bdf6
186 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 0.9997

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://xajibur.ru/123?utm_term=gym+workout+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481821/normal_6010c4f981d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_60198a62221f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601d220c0805b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6047ee3f44a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6038c44824112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_718af02e2b6349d9963750401adfce35.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_0868b66b5159435f95ad634fd91bebbf.pdf?index=trueIn PDF document text
    • http://xewenofos.epizy.com/audio_tape_recording_format.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_1bf2638116224dccbefbd7287c74e38b.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_c874dc39e3624cb09762f5c8975a9093.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_01d845e9a71541f1b585c60b71140efb.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_10dce984e11f40f2a5c6280f9615e328.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_717c0f7893374f8b905858141f520076.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_5438089177f948d99a3c552489b7895d.pdf?index=trueIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_1d62562182bc49f399e4c49e4f50a284.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7803a218c0454678b391d7cec4e8a0b7.pdf?index=trueIn PDF document text
    • http://sirirowevaga.rf.gd/15802980612.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_74c6a290de3542d7a7ec8ac8a0509461.pdf?index=trueIn PDF document text
    • http://botemexake.rf.gd/cartoon_animation_app_apk.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/vinomutogad.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_af90570219784d0e8221090a77dfa514.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_off000161df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DF 5136 bytes
SHA-256: 045d32f9e136c6969e5ac1f928b82773404ce1ec81555166988e29578592a240
font_01_sfnt_off0001736c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1736C 11764 bytes
SHA-256: c291b11d3752e6fa23dfd36cc4c2b3c2d50d788ea25a8b7c5a60624f7575408c

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