Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c791fa177e500b…

MALICIOUS

PDF

65.8 KB Created: 2020-12-04 23:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 31a497f2ae134d699a925a88c2e12504 SHA-1: 527d15b1c13d813bcf47b30d44780bed55a99839 SHA-256: c5c791fa177e500b90d91077ddad5ad485af3aec0e7be404d1b13045f073db20
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://trafftec.ru/123?utm_term=power+towers+math+game', is suspicious and likely leads to a phishing or malicious site. The document body, though heavily obfuscated, contains references to 'power towers math game' and authoring application details, suggesting a lure to disguise the malicious intent. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

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://trafftec.ru/123?utm_term=power+towers+math+game PDF link annotation
    • https://juxetume.weebly.com/uploads/1/3/4/8/134879156/gatajijajen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8ebf2156ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f986fbb52d32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e464ab79f442f229936f/t/5fc8b769d6e0cc37e3434462/1606989674331/zogedujuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5444f0fc-5275-40d2-9684-69dca373e0b6/30513211287.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfdc47a13a450babee0d2c/t/5fc213b9e6d49a06bbda2628/1606554554726/bogobireziviwev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54b8ff7cf8c754047d5ed/t/5fca834fa08b9342fa9d8183/1607107407793/jofabafa.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/como_te_sientes_hoy_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/dozobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46df829f-3da4-4130-95c0-b3e848f39a29/2nd_grade_book_club_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/aamc_practice_test.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf68dfcb3e0f577147c89b/1606379749115/basivegakeligikudofukewub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58d04cd1e280355f3c276/t/5fc60fa74f98375720aea51c/1606815656451/22791299683.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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 5160 bytes
SHA-256: b8132424ccf9fa0fdfa7640d5137a529499e6b297951e875d1ed85079c5b08e8
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 11700 bytes
SHA-256: ebb213165f5f4dd07f6f9cbce1e2cd0e3e984ae8a185689172f1b2fad49267dd

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