Malicious PDF — malware analysis report

Static analysis result for SHA-256 9587cae268ad3d46…

MALICIOUS

PDF

78.3 KB Created: 2021-06-03 15:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 68ce1e18738c7acdae2e01c88e740963 SHA-1: 75724e1d54b6479ef910209eb0280a05be18a1d7 SHA-256: 9587cae268ad3d46a3f7d0402ff577bdd6e6cd3bd4b4b0c8b878cc4fd494f308
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=othayadi+paathayilae+mp3+song+masstamilan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63bd2c0f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_601bb5577d1a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98a740239a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fdea3fc93ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_5fd8b5909d17e.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/ca1bdc81-f220-41d3-b2c7-960dbc11655b/jibemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064c3aab-ca78-4d00-a08c-2be2e0d3d96b/acer_monitor_no_sound_ps4.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/79334122390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3fc294-d455-4251-961c-24d2748ceef8/38362803707.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/xutolusijukagugigo.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144446526/pagutadebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dea7c8-5ce4-40a8-963d-a273f663b2ad/whirlpool_washing_machine_service_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f03f20-4031-422e-84e5-d1edf26e76bb/the_cask_of_amontillado_reading_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bfdbbd-68f1-4177-b769-7ffdee6d33bc/old_navy_employee_handbook_dress_code.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144467022/6558247254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e934e3c-02d7-4604-be14-be828df87071/wuxafowifovejiwiraratu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0055211-8fa5-4e45-8fff-7648c419d57e/8296071546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23eb13e5-6d0c-49bf-bb60-ea2b74d09133/detective_chinatown_2015_movie_download.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/40177370996.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144555561/how_to_adjust_cobra_f6_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cabe73-0723-4f4c-aa81-c87213d4c792/can_you_learn_electrical_engineering_at_home.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144415950/1155447454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a4d3a9-b685-4e6a-b55a-1fbd3b10a295/aws_certified_solutions_architect_associate_practice_exam_saa-c02.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5360 bytes
SHA-256: aa1e0cc0ef9dc0b8cb6d6d961c74b6b104ae98b8a0a5d7becc38cfbdbe4ed402
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10768 bytes
SHA-256: ff461a59ddccf70329db3d8330f9e2bad241f52c66f620e77ab50c12efb081c3
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333