Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb431e93fda80685…

MALICIOUS

PDF

77.8 KB Created: 2021-05-29 05:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cd32f57edd422af15398e0cb74f74941 SHA-1: a38933a81457339114c45c9b777cc1dba59657cb SHA-256: fb431e93fda80685f5d340f97d02d8a4381428e39d8447091b22a0b310d41725
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical detection for a link farm and a high ML score for maliciousness. The document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the PDF structure and the sheer volume of external links indicate a malicious intent, possibly to distribute further content or engage in phishing.

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://cdn-cms.f-static.net/uploads/4468827/normal_6044a090cca3a.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5fcd0471a96a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_60285d98e2057.pdfIn PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/zadedanus.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/8735170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fe35d754f721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_604029580889b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_6016726d66885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_602a9de2d0eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5fe7cbb1afff3.pdfIn PDF document text
    • https://medekokimezud.weebly.com/uploads/1/3/4/7/134748457/visidubo-lajoxewido-wabop-nefojurutopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=how%20to%20blend%20using%20colored%20pencilsPDF link annotation
    • https://uploads.strikinglycdn.com/files/5d3b2253-515c-4e12-9415-4cccfed14543/kung_fu_hustle_2_full_movie_tagalog_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf8d09d-a80b-4361-8a1f-d0410d5fd26c/wedobigaxisabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87724d88-08c3-4608-963e-5b67c9f89dc2/the_game_of_life_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b928242-8107-4479-bbaf-4a04eecb8413/panexotilonupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11900e90-501a-400f-b654-32c50b382b89/how_many_calories_in_a_small_soft_shell_taco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e11ab96-886f-416b-bafb-34c9b69cf744/zixiraleloxiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d79cfe-ef7f-4b31-aeb9-3293964327a3/kajafu.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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 5224 bytes
SHA-256: df8f7a9bf55a213e76c1590ec50175b384985cdb9a0f9a2df55285dd33bab3b8
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10456 bytes
SHA-256: 2ff8053323c782e30ca423e1eb31235e680b5cd2bc5820e7de029bc98e0d64b3

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