Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4965cf69ac9bc7…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 01:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ebb3ff8181f43a42c00030f41d96bde SHA-1: 9fbace662dd3bfbc03c5bf0a12784d66cb72e284 SHA-256: 8f4965cf69ac9bc7b02b8d0c4ebf79a62f4eacd85e9716aaf1df98f186a2424d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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 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://pelibifir.ru/wix?keyword=yellowfang+warrior+cats PDF link annotation
    • https://cdn.sqhk.co/tufiroxova/j3EAVA9/doors_of_perception.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5ff4aee934df0.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/dVwAmzN/88537892729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_5fd78394362cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_603b3bb617fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fd109d6bfdb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fcb71cad1aec.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/bMCYgj3/14172010004.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jajbNhg/ladies_tool_kit_home_depot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_60073ae25ae59.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/rabewiruzitewa/what_is_a_systematic_literature_review_and_how_do_i_do_one.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_cadf96b2ba6a41829abd0d587e0ddde0.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_7318c0adbc36414b861451a201098b78.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_572cfe308137416a8ea0a3f62ec5698d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/61342756185.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_83549f9f561b42d2b07a21e34184c609.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/weather_news_report_sample.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_ff77a581e3be404386ee4554f7bd2225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 5104 bytes
SHA-256: b8837036e7d2e4870d566d4db8b7d3d2ac5de830df5bd5edaff1e2775bc66fe0
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10276 bytes
SHA-256: edde96b59e7a6a0000e64b803f229ce25fb9744d6b111d0764de6d3bab1ba6ac
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16920 bytes
SHA-256: 008f064d9e30f55dc16477a1c9de86311d84fc8a3917d3adc6d57d175ac0f190

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