Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d65e4615d00339d…

MALICIOUS

PDF

75.5 KB Created: 2021-06-05 16:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd32c3a7aeb3ebaf9b8a8837efba2a2a SHA-1: aa6622d843304c1860bae2d050bbe4c8c1020928 SHA-256: 8d65e4615d00339d1d7b066d6c989c4bcdf93f905126758fe49167c58629d597
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://bologen.ru/123?utm_term=reformed+baptist+churches+in+texas', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to direct users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=reformed+baptist+churches+in+texas
    • https://rojemazef.weebly.com/uploads/1/3/4/6/134666767/50d7071b.pdf
    • https://bawowafakapapo.weebly.com/uploads/1/3/4/0/134042412/4d123fb6d2496.pdf
    • https://jutixabit.weebly.com/uploads/1/3/4/0/134017524/2206036.pdf
    • https://zefuriduzowav.weebly.com/uploads/1/3/0/7/130740504/2672025.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/62fa88a2-d60a-4cd7-bdce-07a81d84761f/zolepunebopose.pdf
    • https://uploads.strikinglycdn.com/files/35b492b2-fb60-4c36-bfc6-b67029aacd59/liftmaster_not_working_after_power_outage.pdf
    • https://uploads.strikinglycdn.com/files/77a242f3-9e3d-4570-a08c-f67d4888c23e/78643624032.pdf
    • https://uploads.strikinglycdn.com/files/21959f36-ec8f-4c7a-9615-56665c72915d/how_to_write_income_and_expenses.pdf
    • https://uploads.strikinglycdn.com/files/0e7a1dbf-0034-4612-b283-cea8dea29c06/ipod_touch_4th_generation_glass_replacement.pdf
    • https://uploads.strikinglycdn.com/files/24786675-9648-458f-855d-f42608a08000/quadratic_formula_word_problems_worksheet.pdf
    • http://wixugigir.pbworks.com/f/limited_pets_lawn_mowing_simulator_codes_wiki.pdf
    • https://uploads.strikinglycdn.com/files/800e99ab-abb1-469e-9e20-06567ec4abac/21596761884.pdf
    • https://uploads.strikinglycdn.com/files/8b495470-f459-4f82-9105-405f7d28363e/zolulezadadopakow.pdf
    • https://uploads.strikinglycdn.com/files/ff476bc4-c94d-4641-a7e8-1370bc7845b8/wefal.pdf
    • http://gibuwodebu.pbworks.com/w/file/fetch/144495879/21076887453.pdf
    • http://faxamom.pbworks.com/f/asme_b16_5_2013_free_download.pdf
    • https://uploads.strikinglycdn.com/files/bd557f66-89db-4a23-b9c5-8a8ef33028fb/vocabulary_builder_mesopotamia_content_vocabulary_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/393b419a-0568-411e-a91a-506fd2f4c569/22424951853.pdf
    • https://uploads.strikinglycdn.com/files/3b72358f-d5ea-45e2-be60-73d1bf43c1eb/37772083600.pdf
    • https://uploads.strikinglycdn.com/files/099d9ee5-0ca0-4c7b-a634-873330c011f3/zifuxul.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_off0000e710.bin
f1bc899a82bb2c3a3180a224a0eafc3f9e563159523c634b8d1a024cb38babde
pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 5576 bytes
font_01_sfnt_off0000f9e0.bin
abc7f5eb26177946f3a39c3dd80695b64c98015aca7b7674fc42b986f69a181e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11508 bytes