Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dae3d396b7e160…

MALICIOUS

PDF

67.3 KB Created: 2021-01-26 07:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 222203233b0ea80fdbf72f875247579d SHA-1: 748ed1d81ae09deafb3fc171dda3498c181de8ae SHA-256: a6dae3d396b7e160646959eb2a96051e95196db22ca26b81d7929c8a1da6c213
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful content.

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/123?utm_term=ampeg+v4b+schematic PDF link annotation
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/zevebafage-tebofekogixo-vekuximizusole-jimibiwaja.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/2796713.pdfIn PDF document text
    • http://septiki-rf.website/31866873396hjgzb.pdfIn PDF document text
    • http://vzale.ru/catholic_religion_meaning_in_bengalinymf4.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/VMjghbG/82254023264.pdfIn PDF document text
    • http://blognews.top/738342242647ml92.pdfIn PDF document text
    • http://idealica-tufficiale.website/super_cat_tales_2_walkthrough_4-_6ydogj.pdfIn PDF document text
    • http://study-english-05.site/whisper_of_the_worm_catalyst_chests_solowxhsj.pdfIn PDF document text
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/pulasufedilofe.pdfIn PDF document text
    • http://goloszauniver.fun/wonder_pool_paragould_ar2kjmo.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/byFgg7V/smith_s_grocery_store_las_vegas_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/frVjeij/mivivokudibo.pdfIn PDF document text
    • http://dompodklyuch.com/dobiderubowoxesh2w1j.pdfIn PDF document text
    • http://hellesypakk.online/dagukiretokadubewoli57jqv.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/04ae08.pdfIn PDF document text
    • http://1xbets-reg.site/kalejekudlw9nh.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/YJxRD2c/pojokekopetijivubina.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/iegcCt4/nbc_sports_bay_area_giants_stream.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafasegu.epizy.com/49466033373.pdfIn PDF document text
    • http://tinijev.epizy.com/2015_audi_a3_service_manual.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_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 5496 bytes
SHA-256: 3839d475122ab183f391b4c62ef3f5df1c1302d6d2abfaa855753b0e7cd1c700
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 11228 bytes
SHA-256: c11ef365b726acbaf5a49c64ed9899c76dd2335fb824365881f31a6213b90bee

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