Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb69835c7e3d9e45…

MALICIOUS

PDF

72.2 KB Created: 2021-01-31 04:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 74351fb65483055c1a995e0ffbc09d2a SHA-1: 125dcc2a9841a2e57691bd0d98f51d9c17ab6cc2 SHA-256: cb69835c7e3d9e45716344ac4bf6a0486454dad52ebbfd536af0d7c67bb3b375
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are presented as links to popular games and movies. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/123?utm_term=jedi+fallen+order+coop+campaign PDF link annotation
    • http://fuvafutiku.22web.org/beat_saber_meme_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/ZbLiaCo/movie_trivia_questions_multiple_choice_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/g08lQdV/nobodies_murder_cleaner_mission_6.pdfIn PDF document text
    • https://duwatazajopi.weebly.com/uploads/1/3/4/2/134235013/xojarukusajalawe.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/jdNPhhc/knife_hit_game_tricks.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/e196a970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_6009a9926432f.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/212e69bc73a6.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/free_personal_hygiene_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_60026047c3c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465941/normal_5fe3c063520d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/hgicQhc/91679565756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzeberipavol.rf.gd/bezubaan_ishq_movie_hd_720p.pdfIn PDF document text
    • http://resifidivef.epizy.com/51750995087.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/al_quran_tafsir_by_word_apkpure.pdfIn PDF document text
    • http://xojazexodiwosi.epizy.com/43226650221.pdfIn PDF document text
    • http://tinafominur.epizy.com/20603407230.pdfIn PDF document text
    • http://kijibabekisuni.epizy.com/commercial_cleaning_contract_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5284 bytes
SHA-256: 7df01072b8ddd15e454d68f79907cde823f567e6ae223480457d5b1743ac0b0a
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10396 bytes
SHA-256: 16708979053ffbe73b50d78abcc4c1b98090bed2a48c49c3c6976d35166495b2

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