Malicious PDF — malware analysis report

Static analysis result for SHA-256 3941b21e4b39f28f…

MALICIOUS

PDF

76.7 KB Created: 2020-12-31 19:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0234dadae25406fc75bc2e8646b5785 SHA-1: 97d119a0e1bc8cd6c8ba80a713c9c629af9a36d1 SHA-256: 3941b21e4b39f28f49c1f82db4535e6952700ccae004bb1ba019216e89ea3b8f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://trafftec.ru/strik?utm_term=smash+champs+mod+apk+rexdl' indicates a lure for potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=smash+champs+mod+apk+rexdl
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/9682050.pdf
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/a7b78f0.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/3971921.pdf
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/dejozakagop_likejiw_witena_zosew.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/lebetise-letefivex-jamolojosataxuz.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/5522997.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/4010f08d.pdf
    • https://cdn.sqhk.co/seponidozit/fihhbjc/islands_for_sale_usa.pdf
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/3653876.pdf
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/2926854.pdf
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/4d0da86.pdf
    • https://cdn.sqhk.co/latusetime/jfEd0jd/3d_galaxy_neon_fidget_spinner_themes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d02a784a-c7dd-4e79-95f0-6a88703612c2/daughter_from_danang_trailer.pdf
    • https://uploads.strikinglycdn.com/files/8d3ee81b-2777-4a88-915e-4c5d8e8fe029/93192302045.pdf
    • https://uploads.strikinglycdn.com/files/0c909210-aefd-48e4-aba5-e6a450a49819/exercices_complement_de_phrase_cm1.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89e.bin
67ec463d9fff393bdae6b8298ad09861fa104656bfd120920153021ab93dab0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 5548 bytes
font_01_sfnt_off0000eb50.bin
620f1a03ea8890421f47d3fa0d65f5c9a05404eabca5222631533664fb3c611b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10888 bytes
font_02_sfnt_off00011105.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16092 bytes

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