Malicious PDF — malware analysis report

Static analysis result for SHA-256 29712ac80ababe2e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-17 20:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2bbd202dc6395c4941ed17537dfce716 SHA-1: 0fe202aaf7d806af8fa3d91b36a0d0f54a7e6d90 SHA-256: 29712ac80ababe2efaddf15133974c44fcc75c92a0f32399415014fb80399e52
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains a mathematical problem, likely a lure to disguise the malicious intent. The presence of multiple external links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=integration+cos+square+x+dx+is+equal+to PDF link annotation
    • https://cdn.sqhk.co/jesupesiparu/ijsvqhg/20348644672.pdfIn PDF document text
    • https://zoxaxutonixada.weebly.com/uploads/1/3/5/9/135957052/bavifemetodavu.pdfIn PDF document text
    • http://xuxuvojetuzutej.iblogger.org/gujitipapufexomazizuvujok.pdfIn PDF document text
    • https://fiwadevu.weebly.com/uploads/1/3/4/5/134592392/devadeva.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/32aae014.pdfIn PDF document text
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/6177480.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/dGjamb4/shoot_the_duck_game_free_online.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/54d40950-53e4-465f-9971-9f7b7add2796/jebapifuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90fc247-72fe-4b47-92f9-9d7faa677d6f/dyson_dc35_brush_bar.pdfIn PDF document text
    • http://tomijejimener.epizy.com/98326896611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835f9ba8-c466-497d-8032-180063c6ee85/puvix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc15f04-2b6b-424c-a3ea-ea1603d8fd4e/jadoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1bb868-1bf9-44df-9d31-2abcede7bf06/53433013570.pdfIn PDF document text
    • http://nanizezuzodujo.epizy.com/the_plague_albert_camus_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2346d265-a3a9-4b7e-981d-0d12c20f5fb6/xotoravukitelonopofag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c263b5e-2083-4986-a619-e549c237fb92/best_ccw_holster_for_taurus_g2c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d44fd5-1231-4e8d-9319-9a0b3866d226/jiranisalijunejeliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b337002-76eb-4981-b118-da55e12a3a0f/gufedeji.pdfIn PDF document text
    • http://bivofigelekira.epizy.com/practical_skills_in_biomolecular_sciences_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fc45ab-c62d-4677-a3ee-344787077ace/92893097046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef9268e-bc44-48bd-9f1d-9e8ddcb9c597/xekilalotula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bf8484-f070-482a-87eb-c74b205e7237/wim_hof_breathing_method_how_long.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d08a70-a922-41ba-a40c-e49d7229a210/ratamobepuwowawuxijife.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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 5120 bytes
SHA-256: b829748d1eb8c9f9f7f08d810be7a06d2724aac27dbf5657bdf43bbf80a31dc7
font_01_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 11456 bytes
SHA-256: a7f0052fa5dcfa6417f1cb9b565a06feb49a71e2cf19d3d16b001b21cf2a2b95
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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