Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b6c028be5f1ea…

MALICIOUS

PDF

82.8 KB Created: 2020-12-28 12:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 81494c276c54f68ece3e5cebb12988d8 SHA-1: 5942f2fc45c44420536f7909cc5b28334024e141 SHA-256: c94b6c028be5f1ea306c6cc1d6b65c3fff18fd7d8b9843e0e13860724a137fa1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on external services, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=az%253F+rbaycan+opera+v%253F+balet+teatr%253F PDF link annotation
    • https://zopugazuf.weebly.com/uploads/1/3/4/6/134658021/6123242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5fdb8f63c89ed.pdfIn PDF document text
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/fasijomoxus-jagej-lalisobidowoge-baruz.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/gabil.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/9d76c3d6462.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://uploads.strikinglycdn.com/files/5bccbdc4-0b2e-44e8-a815-c957be8b2fd8/79899901255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6767d0be-2f3e-4073-8c23-24f7b438afff/skyrim_add_skill_points_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6412ae37-3b0e-454e-a94f-c34a3ca323dc/66210539767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613ba7e9-af1e-4e94-a8d2-84e13959dee0/84265262208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56579a78-0077-4996-a97b-ecbdbb3a522a/22537976317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1470d55-c0ff-4a2e-842a-6fd544c81bd9/pony_creator_v3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980063a5-0427-4139-9ca5-872d7b910e27/73540921872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e2e1f7-ca27-4f9b-9c34-dc81ed151b99/higher_learning_technologies_careers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240a4854-a359-413f-a355-a4aaba507a2c/advanced_crafting_dragon_age_inquisition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 4972 bytes
SHA-256: d57d9c71d72d0d11644aad245721e096ea0f785340cdf2ec526ac0eee3f159a0
font_01_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 15796 bytes
SHA-256: 8fae0a906bc70769eaf1fbd3c8b9ece829fa852f0c9dc09776c52535e99a0de7
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 17848 bytes
SHA-256: a7cffb3bad8600d0e59aece39417c51529e9ed9c195676a5e27ec3481e1b3dd8
font_03_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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