Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b08f7f6abb9ca4…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 06:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c84092a18a491fd48e03f27c23995083 SHA-1: 82649ef0848a19203a9ad080f54beeb707f81a9e SHA-256: 94b08f7f6abb9ca474871dee49fdee05f422bf21b650dfb7957372d76d2c71a6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many of which lead to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=sat+subject+bubble+sheet+pdf PDF link annotation
    • http://7evenrp.ru/calories_in_el_pollo_loco_flour_tortillaf12vy.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • http://beremoter.online/amoxicilina_250mg_ml_bula7cs9y.pdfIn PDF document text
    • https://cdn.sqhk.co/raxipopu/ihzbKia/special_forces_group_2_apk_indir_uptodown.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/abrsm_theory_book.pdfIn PDF document text
    • http://pewujok.mypressonline.com/40103953864.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/giczEia/1190528980.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Sjajgie/58851801271.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/cbse_ctet_question_paper_2020_download.pdfIn PDF document text
    • http://vakotuwudar.22web.org/what_is_the_price_of_honda_dream_yuga.pdfIn PDF document text
    • https://cdn.sqhk.co/fojupigek/idhiIsW/axis_football_2018_gameplay.pdfIn PDF document text
    • http://wusapibixabupak.iblogger.org/dijenoxebinanul.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/imT0lTl/mindustry_github_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/kofemapajomi.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/how_to_reset_galaxy_grand_prime_plus.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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 5948 bytes
SHA-256: 438a24231ac455b228b699c7981a17ee655d71d37e50a5eeba7d80190c602909
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5468 bytes
SHA-256: 3f62bc7846e5d147a956f0f4e8e4bf0490d4344825402abf2f809408d37dfebf
font_02_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 11020 bytes
SHA-256: 0602551b999525659310a4910d76e3197b69396f5b09cd7054b2ae68ee393869

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