Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42766d98260a049…

MALICIOUS

PDF

79.7 KB Created: 2021-03-02 18:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c5e8c8e1d45ed5c75e84b1725b178bdd SHA-1: bf41c0a37b8186b83c0712461e72abfa30fbf631 SHA-256: c42766d98260a049a724427fe22fe7cd582440af8392606e513f97448f270c32
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to reference 'ISO 22000 documentation requirements' and includes metadata from wkhtmltopdf, indicating it was likely generated programmatically to serve as a lure.

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://gimoguvi.ru/award?keyword=iso+22000+documentation+requirements PDF link annotation
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/7bb8b75d742.pdfIn PDF document text
    • http://raicen.com/sivatalagos3qu0.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/94505488250.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/37c270d722ab7.pdfIn PDF document text
    • http://0fruits.space/challenge_full_hd_movie_bhojpuri3enkl.pdfIn PDF document text
    • http://good-production17.site/watch_with_friends_amazon_prime5hyo4.pdfIn PDF document text
    • http://okstore.info/14081962796tm3x8.pdfIn PDF document text
    • http://idealica-tufficiale.website/harry_potter_chocolate_frog_cardsguvfv.pdfIn PDF document text
    • http://formulamoney.top/48184196523qcsr3.pdfIn PDF document text
    • http://aicberg.net/pokemon_infinite_fusion_rom_download_androidu8lk3.pdfIn PDF document text
    • http://garantiya62.ru/luxojivektwvl.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/6948670.pdfIn PDF document text
    • http://segwaywheelchair.ru/dekipivurupelotudinix37e.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/6225020.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
    • http://labinugekifuv.rf.gd/accumulated_depreciation_equipment_balance_sheet_classification.pdfIn PDF document text
    • http://jezuwujitek.epizy.com/vibulosiregonu.pdfIn PDF document text
    • http://toberijalija.rf.gd/hp_deskjet_7310_ink.pdfIn PDF document text
    • http://dibawuleseba.rf.gd/how_to_combat_auditory_hallucinations.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 5272 bytes
SHA-256: a4b54dbeba18486d95d48d41f78bf8729d123da6e30844d62e61e5c3872c1844
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10264 bytes
SHA-256: 3357bfaf69d38158289360bd12b109847b88b9e88bd379987b29f49796abdafe
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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