Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b4d4b8a84ec6a7…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 03:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a414d45a2cb137a17cf3c49379725d64 SHA-1: 39a1a9865d7a5b3d07ae34bd5b97ddd7f6742e36 SHA-256: 46b4d4b8a84ec6a7ece9654494928456ac38902a7eac6a9982eb9698d307c7e3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a common tactic for SEO spam and phishing campaigns. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a large number of links pointing to potentially disposable hosting, suggesting an attempt to manipulate search results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/award?keyword=being+a+great+leader+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444351/normal_600f75d9bda6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_605fbc5a9ac25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_6014dc4d2e235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_605a78a625d4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5ff8d531b193e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_60146bf68b396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_6045f32548b02.pdfIn PDF document text
    • http://modalidetefid.iblogger.org/28264701657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_60117d1f8fdca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_6063185fae5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fe4ef713576d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fc5857015df6.pdfIn PDF document text
    • http://alex-chekalev.com/consolation_of_philosophy_sparknotestjo1q.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/69955857191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5fc9771c8166a.pdfIn PDF document text
    • http://jobware.pro/zowunopizipegawozum75ov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_60312fe873e81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_1c7b94f88d6642d5a518b823a95530be.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_5a4e9f12a4354188ba3b90a686df5669.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_3da6a2cf341545e2b16c0fec550d4487.pdf?index=trueIn PDF document text
    • http://gagujejadozudor.rf.gd/tizen.pdfIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_df971dbe9cd3483bb950f84fa97077c0.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_43e0cf1da2de4c519c1ab1029a3a41f9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 4760 bytes
SHA-256: 683f4b4018fe74047e77a6a8df8dd793720d80dbf119ea60f1dfa7cad4ce6bad
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 10540 bytes
SHA-256: 34c9619f0b303fe392f573b1658700f7e9089eaa0d6f97a23d9d9734aa111a18
font_02_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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