Malicious PDF — malware analysis report

Static analysis result for SHA-256 5467554401148544…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 11:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9cd8e416c4f05718265f94f6e721bd2 SHA-1: 75bee547eec4b4864847fc03df9f4b3ba43d87a1 SHA-256: 54675544011485442e3c88a1e16364e34d494b3e0cd7bf2e3d63786218322965
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being https://jumiwimov.ru/strik. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+read+random+number+table+statistics
    • https://cdn.sqhk.co/xubuzivo/jheijim/widutoserudo.pdf
    • https://cdn-cms.f-static.net/uploads/4495536/normal_605003267ab9c.pdf
    • https://cdn.sqhk.co/kasavakujosi/ff2ighc/rivasoresexewu.pdf
    • https://cdn.sqhk.co/suzironanes/gdALje0/98816912757.pdf
    • https://cdn.sqhk.co/kifuzopeko/dEGzYii/16482083360.pdf
    • https://cdn.sqhk.co/sigidezok/ihaojed/groove_life_belt_commercial.pdf
    • https://cdn.sqhk.co/dawajimet/jcnYjci/91464824301.pdf
    • https://cdn-cms.f-static.net/uploads/4472481/normal_6021d6962c5fa.pdf
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/bemevobirifoxok.pdf
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fcb9abf0f02c.pdf
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5fdc1ba6cca23.pdf
    • https://cdn-cms.f-static.net/uploads/4446762/normal_603be2c1bd4b0.pdf
    • https://cdn-cms.f-static.net/uploads/4491450/normal_604f37b5d692f.pdf
    • https://cdn.sqhk.co/lukulugere/cJLxgid/cardiac_rhythm_strips_test_for_acls.pdf
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6015e0b7d0cab.pdf
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5fe2977bad5f3.pdf
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fdba898f27bc.pdf
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/92e0947037a4f77.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_e8bdcc6a03f94ba4926e040d03e0e259.pdf?index=true
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_e777e8320b324d02b89c408da144dc66.pdf?index=true
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_89c56d5879284fdba707192143fe1eb6.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_5f3dde02fdb84748a4a9c073c076b242.pdf?index=true
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_41a3b99f866145de9118048d6d547134.pdf?index=true
    • 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_off0000f9ca.bin
61582c63c92c45a5fed3efe436011caded58eaccda3ce24f432afa9dfec91d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 5276 bytes
font_01_sfnt_off00010bb0.bin
acc2d1042703a6a689abd67acb47e6dbd99b3a49aee2a4a76fe82f4701336264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 11092 bytes

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