Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33c3e557b0b9e06…

MALICIOUS

PDF

76.8 KB Created: 2021-02-14 19:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d456a1c4b368c56f1461d17e2fd8e940 SHA-1: 76c4b7b28c25ecdad834909e02089dae80628415 SHA-256: a33c3e557b0b9e06a36671805929462a4e296c1a702e7326dc8deaccf52f63e4
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 external URIs pointing to disposable domains and link farms, suggesting a distribution or phishing campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=hd%20voice%20recorder%20software%20free PDF link annotation
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/76c06cdf67599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_601e67aa3fd41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_6027c9076c394.pdfIn PDF document text
    • http://italdom.fun/hazop_reportzosiu.pdfIn PDF document text
    • http://trenketo.buzz/coleman_powermate_2500_watt_generator_manual8v9qu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/Kl0GFii/99636068400.pdfIn PDF document text
    • https://cdn.sqhk.co/dasupejej/tjeibeE/38998416580.pdfIn PDF document text
    • http://im-marceting.site/village_pottery_art_studiormc7h.pdfIn PDF document text
    • http://naturalgood.space/repiwifufcxst.pdfIn PDF document text
    • http://tomogorman.com/net_technical_lead_interview_questions_and_answers4p12h.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/lanekilejo.pdfIn PDF document text
    • http://help-mediasupport.com/4514339124764xdg.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/gij3vja/44864382884.pdfIn PDF document text
    • http://cyberlife.store/xaguxinuzigi4gyy6.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/gGhithh/mancala_board_dimensions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ffc0b151f1a3.pdfIn PDF document text
    • http://igcopyrightverify.com/official_farkle_rulesa0akx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5ff8a3429ad92.pdfIn PDF document text
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/411d4d8.pdfIn PDF document text
    • http://3gusevshop.website/94078339916wm2x0.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://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_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 4776 bytes
SHA-256: c9c39f747ddf6d85569a639d90cc7c98a4782c0b471ac33895ead3db31ec5811
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10536 bytes
SHA-256: 3057afcbbd6642394b08a4a04cc15a54006745bf6186fcaf8412887c02cd8974
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.