Malicious PDF — malware analysis report

Static analysis result for SHA-256 35781eb036f52764…

MALICIOUS

PDF

79.4 KB Created: 2021-03-10 16:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a69453e244b72a9498f74037fda6a6 SHA-1: 2c2d1c045db96ced67be2571a826e6db5b22d9f2 SHA-256: 35781eb036f527645975e9bbb26c8c09dc410ee8f25d617acd9a1c6fdaa3872e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farms to manipulate search engine results or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=calculus+limits+and+derivatives+pdf
    • https://static.s123-cdn-static.com/uploads/4383923/normal_600448b30a2ba.pdf
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/5904663.pdf
    • https://cdn.sqhk.co/fesoxuleri/YidBMjf/castles_of_burgundy_card_game_sleeves.pdf
    • http://retapadu.medianewsonline.com/57274806188.pdf
    • https://cdn-cms.f-static.net/uploads/4492250/normal_603c2f9094b4d.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_604331a362545.pdf
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/zenijoba.pdf
    • https://cdn.sqhk.co/dimumaneda/higcygi/wrestling_amino_apk.pdf
    • http://kopogaxepaku.sportsontheweb.net/24026001492.pdf
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/turedufowani_pogujepovofe_sevusifep.pdf
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/fureke_mebikotage_rixeri_zazapolopegatun.pdf
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/kuwikuduwubare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_31f1b788032a4223b861b7042828f3cb.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_790d9ac32f84434f90d2a944fe171a24.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_d6fa3e21799c46939a8b60a3c1626360.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_6028d1664d2b4bf0b58a54a44ce21a75.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_d9cf3834f16b445e9f4c71e92a728fef.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_e4c2d2c8af67414384fd685644dbd672.pdf?index=true
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_b096b6fc03694e9b88a8ebaf439b9182.pdf?index=true
    • 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_off0000f843.bin
2ab7ceec04b309abaccb119c0caf3c4c4916d494cfab18aa736de2c50d731598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5264 bytes
font_01_sfnt_off00010a14.bin
0e16e76b94f8c6ddd19a8e3daa63195bb9326b4ace5601ce73ab1bf1b4cc2dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 11092 bytes

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