Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c258626748ce7a…

MALICIOUS

PDF

78.7 KB Created: 2020-12-30 13:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3094accbc754e9db5e203d5c56cc8c59 SHA-1: d051d7fb79156f1626bdb0ce374670c4812225ac SHA-256: 74c258626748ce7ab362638ebdbae37e0ef7e2c9b4d0868c881847316ed1bcbf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://trafficel.ru/strik?utm_term=stickman+vs+zombies+online+game', indicates a lure related to an online game. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://trafficel.ru/strik?utm_term=stickman+vs+zombies+online+game
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5fe7a62ae5aa1.pdf
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fcd39f15d3eb.pdf
    • https://cdn.sqhk.co/jememobak/anibjdk/fojugiminegoxet.pdf
    • https://cdn.sqhk.co/vakiduju/2hbxjjm/79757181550.pdf
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f9269b0c17ff.pdf
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/fezonoxekokip_dariwurumuxa.pdf
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8ee8a7a939e.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_5faf833974a2f.pdf
    • https://cdn-cms.f-static.net/uploads/4486353/normal_5fe793db8d12c.pdf
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5f9e10022d85b.pdf
    • https://cdn.sqhk.co/lasesekov/dShehbp/mikotafas.pdf
    • https://cdn.sqhk.co/ralapogifur/ghIGZii/kufekezizejowuvamal.pdf
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f9e796bcdcbd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e959d67c-5b5b-427d-ae79-013fa0ddf09f/gugibexirebek.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin
2985ef4f7df1015b750be3e7319758334d4ba2572762672b8a692f76763223a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5228 bytes
font_01_sfnt_off0000fc05.bin
98e3032b391ee67c58fee66bea45f952c55433e904afebe9601a5f3cb67b386a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 10580 bytes
font_02_sfnt_off00012008.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 4324 bytes