Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc09d584572e3845…

MALICIOUS

PDF

87.8 KB Created: 2021-03-21 11:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 754560a0a342603dd77273587dea73fe SHA-1: b099633c51bbb73265a5d69e474397c20e01b6e1 SHA-256: bc09d584572e384555e2c0e5a57dd35378551610c0fbe4465dc287c7654f5634
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, specifically identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and the nature of the URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=navy+nec+codes+hm
    • http://kujakaveru.iblogger.org/free_crochet_baby_blanket_patterns_for_beginners_2019_youtube.pdf
    • https://cdn-cms.f-static.net/uploads/4392667/normal_602639bc86682.pdf
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5ffdea4b90352.pdf
    • https://moxudoged.weebly.com/uploads/1/3/3/9/133999753/342401.pdf
    • http://worodariravo.22web.org/design_of_concrete_structures_15th_edition_solution_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60320cdfd2e0e.pdf
    • https://cdn-cms.f-static.net/uploads/4477379/normal_5fe977fb542a7.pdf
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/4047950.pdf
    • https://cdn-cms.f-static.net/uploads/4487419/normal_601816dc5b640.pdf
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd2fc92aeb00.pdf
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60506c748aec5.pdf
    • https://cdn.sqhk.co/balatexoriv/dOieRij/tenokusudagevawef.pdf
    • https://cdn-cms.f-static.net/uploads/4463810/normal_602299522228c.pdf
    • https://cdn.sqhk.co/pipujevi/i3jajfZ/basebegakobeloxizekud.pdf
    • http://vuxijagodoku.22web.org/wetebajinedo.pdf
    • https://cdn.sqhk.co/verikiweneza/khfiaay/1577069098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dufeniwa.rf.gd/minecraft_install_game.pdf
    • https://uploads.strikinglycdn.com/files/7eef335a-d42e-4c2e-846b-0bc037451456/55010890376.pdf
    • https://uploads.strikinglycdn.com/files/542cef71-e748-4593-839f-32fc7293fe20/what_is_the_meaning_of_stairway_to_heaven_lyrics.pdf
    • http://pasazaxara.rf.gd/57185879866.pdf
    • https://uploads.strikinglycdn.com/files/e314f26d-07a0-4211-b714-e80719512732/50613104736.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011927.bin
a976ca5ef2ceab090e67fe9dbe3ca711a1e126553cd176ced608d7bde9a3c9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 5184 bytes
font_01_sfnt_off00012ab7.bin
9ac7d1354799a21bc400cd17d4ec075b0fa4df0e4f5b5822278bed2b6250b2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 11596 bytes

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