Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3943b55fe09afc…

MALICIOUS

PDF

68.7 KB Created: 2020-11-25 08:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e6fc5773608cc99fedd8404be7b7090 SHA-1: 1fa6956fe149917dcbb4d9f429afc7de0d3a27c4 SHA-256: 5f3943b55fe09afcba7ee747cf3ee72abe288b66b6f6b4fd903f5c24cd63f3e5
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://traffking.ru/123?utm_term=the+village+season+1+episode+10+imdb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5f94d852b1716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fa9c29b4d0cd.pdfIn PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/toliduvogunevago.pdfIn PDF document text
    • https://bugekawimilu.weebly.com/uploads/1/3/4/5/134589579/rolutizixowisu.pdfIn PDF document text
    • https://zitakusosexozi.weebly.com/uploads/1/3/4/5/134595565/tokub-gufukubukusin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8b85044e6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5fbbddf15a1e8.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/vofun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fae7dc341d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f926d85a6a2c.pdfIn PDF document text
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/6985943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_5fb81f7cd7ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5fa21a8385a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f8cf3c001dd9.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/1835335310385a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5620 bytes
SHA-256: 837e02aadd1a9512f6227b741b3e7962a984b7b46074bba6a54a4bc62b573999
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10344 bytes
SHA-256: 2fc3464716fde3e0aac64fd20bd8b550dacb78279c83639356fdc1e069aaaa31

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