Malicious PDF — malware analysis report

Static analysis result for SHA-256 126ee81f8efff50c…

MALICIOUS

PDF

77.3 KB Created: 2020-12-29 23:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37bac5237951d34e36209adae5a30812 SHA-1: 65474ee7a0409d4fab21d5ce9adb75ff9727333e SHA-256: 126ee81f8efff50cfdab153f4d293b10114fe3bc3292bcdb78d2d23449f8d15a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to 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://trafftec.ru/strik?utm_term=hidden+agenda+pure+romance+precio
    • https://cdn.sqhk.co/tikalijit/ibpOijQ/75728741353.pdf
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fa5f12f6bc18.pdf
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fb41aa866fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4501659/normal_5fd149b156581.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5fa09f4bafe61.pdf
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc524583ce94.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f887c6f49a8b.pdf
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f9ffb5d03c5d.pdf
    • https://cdn.sqhk.co/nosuterib/hf7jeGz/extreme_suv_driving_simulator_mod_apk_an1.pdf
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe0807c7444f.pdf
    • https://cdn-cms.f-static.net/uploads/4477630/normal_5fbd89c8a82cd.pdf
    • https://cdn-cms.f-static.net/uploads/4471996/normal_5fbadf3f6ec5d.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fd6d482ba11a.pdf
    • https://cdn-cms.f-static.net/uploads/4417645/normal_5fd8941222112.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdf
    • https://cdn.sqhk.co/kilatelazobe/iDiagib/6878003727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e76b.bin
c60a47f8a3d21a6e2f052ad784014fb7db02e8301863dacac54d3c1747439d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5144 bytes
font_01_sfnt_off0000f8d0.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 1800 bytes
font_02_sfnt_off0001015d.bin
bdf0bd8e1cdfaabed4ca34f3174391d173c763b3b7f154ae17a59488b929702f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 12328 bytes

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