Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc986f01fc719a4e…

MALICIOUS

PDF

74.1 KB Created: 2021-02-10 09:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d3c6ce713c3d3ed5ce79be82998aad6 SHA-1: 3a87b13e73f6d1c4f9e01e8271eb4f3872f31776 SHA-256: dc986f01fc719a4ee9ea1c67740896ca12f9d300cb16ddfd8e3925a3ec7e9b7f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be related to search engine optimization or keyword stuffing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/wb?keyword=android%20emulator%20pc%20windows%20xp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60167de8501a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389394/normal_5fc609dd0ed93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5ffe7ac7508af.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/mhjjgf5/hyperpop_smash_it_all_lyrics.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/dakorarif-makevugunolap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_60176128cde5a.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/dugosoxex_kovefapizudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6016f5ab83b07.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/jdUBJjj/jevasosetedanizen.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/znIJfhe/27094104099.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/fokalivajenumi-tasato-pudasameguwa-vuregotax.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/jiwisi/gezebiwogakudakopaxavu.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/87874879369.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/23729049549.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/jupigobomorabodolinenade.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/sibopetexojabadisekanebas.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/gowawitupime.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/calderas_peisa_duo_f_manual.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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5368 bytes
SHA-256: 6105d54b6ce6db2e59bb7fe3f40a83a387fe5e2e89bbcd00b5264f24bc1cc0d4
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10444 bytes
SHA-256: 563b222b5e86f01bbd2a23cf8813e9e7f34184005ca0180b63981364abce60d1

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