Malicious PDF — malware analysis report

Static analysis result for SHA-256 681080a8b0109b06…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 21:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1fadc96e3c1d0a042a628fdb0b0445d1 SHA-1: b95609fd1c7e548646875da170c92427351e426c SHA-256: 681080a8b0109b061f1267ce857926daa05b1accfdd59ef384c1f2c82c91a5eb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be related to a product review, likely a lure to entice users to click on the malicious links.

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://gimoguvi.ru/strik?utm_term=hp+pavilion+27+inch+ips+full+hd+monitor+review PDF link annotation
    • https://cdn.sqhk.co/derepinejabi/96vicsN/bilatubojotunokewonel.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jihBmgg/woodturning_small_projects_videos_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/ggc5yjg/91815440889.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/7fyhemw/50187544197.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/unicorn_cx2100_electronic_dartboard_instruction_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jhhfEhf/calcular_iva_ecuador_online.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/Tgfgfpt/huey_helicopter_vietnam_rolling_stones.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/fjdPfwi/nipijidefitadukukitij.pdfIn PDF document text
    • http://blockhcain.host/webigoxuxomekorunutojop0i5v.pdfIn PDF document text
    • http://cozyplacefor.rest/lufonilixmwxb1.pdfIn PDF document text
    • http://antonioita.fun/22284220451s4oxw.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/cQoij98/logo_quiz_level_313.pdfIn PDF document text
    • http://vizit.store/70967359916hxzar.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/chLeYaQ/47459553288.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/hoiaija/givuluxuveno.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/fniixJt/24581106498.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/FBnMAij/5724431635.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/hp_scanjet_5590_price_in_kenya.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/ethical_hacking_pptm9m4l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwosotu.myartsonline.com/monopoly_rules_buying_houses_in_jail.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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 5720 bytes
SHA-256: 5eb60b10eb39414c1d7c53eb61c2dc9dac2a7fd7f3341492ff8d660b4ee0b8ef
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 11928 bytes
SHA-256: 52dfe95f0ad000c78bb02086d4be19b5d9123873b1796382a3e1564029f3a56c

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