Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529437f29049bce…

MALICIOUS

PDF

81.2 KB Created: 2021-04-14 16:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 16beec03bae78b15be76f9d8e572152b SHA-1: e44b152e8aaf170bcb6ced495d9e7b48a91e3132 SHA-256: 4529437f29049bcec0711c8489a2b8359a0b21e037c7d703f468d17b681394b8
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with one prominent URL pointing to 'xajibur.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious or deceptive content, potentially for phishing or to inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=list+of+adverbs+a+to+z PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5fdf2516cf5e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fcbd13feec41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fddf38c87d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_605bcc3b81a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_60129e496a9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_604b1cda6299d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6044d0a9e31f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_604d2d2e9734e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5fe0bb8b1f2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_60626012674dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601d22c20fef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fd0fc58edaa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fdbe43dcae39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_603bd095cc2c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5fd9ace44d474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fe402951200f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_604de2b69d2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_60113573ae9c4.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://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_5473f9ca523c495cb88fc9bf19203b1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a241af-b57b-49a2-a9f1-36ba00e79f41/13294841005.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_be599b064fb641ef8a25be3c3e5d0bb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c444b066-f12d-4a2b-b0dd-134ad1b5b4f7/the_creative_impulse_an_introduction_to_the_arts_8th_edition.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_826284e53198452abd9078150458c982.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_cccca48cefde484fae896d4b988bef8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/171e56df-e822-4eff-b9f9-5b648936114b/2_phase_simplex_method_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7804b59f-f85e-4037-b3b2-a3517ce46601/what_is_the_definition_of_chemical_composition.pdfIn 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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 4740 bytes
SHA-256: 204584e1a469c63eba65adcc33dd76162fb5ec4eb6a3edf56c03b717a795eba3
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10732 bytes
SHA-256: 6d25fe9314a332dd103f42f987c539a8c55f57f8a24ac7fd04d4b4ccb9233861
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176