Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb4b760d2d0ff4…

MALICIOUS

PDF

72.5 KB Created: 2021-03-25 10:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c3e660ccc68c500a9cbc479d5d41a8 SHA-1: e4e714bebbbc2465bca6670fc8b9c3aa39c2842f SHA-256: 6bfb4b760d2d0ff4c533ed52eca5bcaad8bf543218e6657202292d66e3464912
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/award?keyword=high+energy+cosmic+rays+stanev+pdf
    • https://cdn.sqhk.co/kisilusotuke/9hhsgfH/hillsdale_college_football_camps_2020.pdf
    • http://show-visitor.xyz/tepovudamoxiwojodilin5f2.pdf
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fc7185fc099a.pdf
    • https://cdn.sqhk.co/dutimapo/shigeja/nizugijipelogedinexufudum.pdf
    • https://cdn-cms.f-static.net/uploads/4486221/normal_5fd67cdc32509.pdf
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60354dfc8e58a.pdf
    • http://car-den.ru/3107470546470fjz.pdf
    • https://cdn.sqhk.co/wusezofetib/9Psiegf/48343532872.pdf
    • https://cdn.sqhk.co/risenulowo/czhjhai/mukapi.pdf
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/kovelu-tubarup-vubemikuvaxub-koludofisuji.pdf
    • https://static.s123-cdn-static.com/uploads/4445130/normal_60068dbfc4e2c.pdf
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/1544947.pdf
    • https://cdn.sqhk.co/fogizotufijo/hh8jchj/51403907742.pdf
    • http://akb54.ru/55154906354avnfj.pdf
    • https://static.s123-cdn-static.com/uploads/4449973/normal_5ff9a652b07d5.pdf
    • https://cdn-cms.f-static.net/uploads/4481058/normal_601eaa1d7db91.pdf
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5feed5f60c414.pdf
    • http://avbox.org/1805191137zmu25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gegilifopom.myartsonline.com/32760216905.pdf
    • http://piwolimosopobu.myartsonline.com/pileladamabikopulogo.pdf
    • http://gepafelixadu.onlinewebshop.net/saladopivur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1a.bin
7eaecf8e23e2ad85fede945139501d995e7b49196ceef54679394fda3dbee31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5660 bytes
font_01_sfnt_off0000ee42.bin
8b79dfa6e3aac52cce77b30e5c218c70543ecf4ae6130272eb8e0e15e5f815b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11460 bytes

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