Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3560be31d76600f…

MALICIOUS

PDF

89.7 KB Created: 2021-04-11 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0022568c9162e962708f2b50bd856c6d SHA-1: 961fc8b4f97a5f6d6d36a6d26fe1bc3e1accb9c0 SHA-256: c3560be31d76600fa7d38046d56682fbb94146f67c268c58b87df0130df07c3e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=restore+dell+to+factory+settings
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6021ef7f2b49f.pdf
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/722fcf445d9135.pdf
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/4054852.pdf
    • https://cdn-cms.f-static.net/uploads/4380078/normal_600abff74e17c.pdf
    • http://bawikivogo.22web.org/19840465272.pdf
    • https://fuzonigeli.weebly.com/uploads/1/3/0/8/130813785/49801b7b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7e80d26d-4ed9-4e74-86a6-c0d2515682d2/duzedezatojukunu.pdf
    • https://uploads.strikinglycdn.com/files/ba67d4f2-b097-4416-8457-d8dbad4bc458/81192542729.pdf
    • https://s3.amazonaws.com/lepefi/1058675136.pdf
    • https://s3.amazonaws.com/banula/wokorirusuwufo.pdf
    • https://s3.amazonaws.com/daxemo/vuvibepujiro.pdf
    • https://uploads.strikinglycdn.com/files/674db954-2678-4309-a241-fb8e045a94a4/97436317116.pdf
    • https://uploads.strikinglycdn.com/files/3aaa033a-2471-4379-bcbf-ddddd1a78952/junito.pdf
    • http://xirixufo.epizy.com/abdominal_aorta_branches.pdf
    • https://s3.amazonaws.com/sefepugolupalax/52046997760.pdf
    • https://s3.amazonaws.com/begijufadi/alpine_linux_apk_add_docker.pdf
    • https://s3.amazonaws.com/nufidibodudulad/how_to_reset_sentry_safe_lock.pdf
    • https://s3.amazonaws.com/pazatuv/dimotowodunaw.pdf
    • https://uploads.strikinglycdn.com/files/37f2173a-3cf4-4abf-804e-a79e3a667477/54727285168.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_off0001140c.bin
793ed3fd677a90b2dff86d58eb4f30b96b6c00b9944ffe71edbb414692b9e1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 5084 bytes
font_01_sfnt_off00012574.bin
d140e9264a459ea0b2475452c56be0f13e19d5d6aef20889dd91111716b04bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 11380 bytes
font_02_sfnt_off00014ba4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 4324 bytes

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