Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f3d0aef40e6dc8…

MALICIOUS

PDF

81.5 KB Created: 2021-04-09 03:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 690445e0408214cb7ff042613f4a4b7e SHA-1: 7c862c773caf5698b886d00bda792b5be178cb1a SHA-256: c8f3d0aef40e6dc82aa843294903b8720a66704d093666a977f6383e5bb9e7c1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing a 'washington football team qb injured' and leading to a suspicious domain. Heuristics indicate this PDF is a link farm on disposable hosting, and a ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the heuristics point towards 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://jacksth.ru/strik?utm_term=washington+football+team+qb+injured PDF link annotation
    • http://spoonnumberone.xyz/jolojilebulobusisiwaderawwd2a.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/hiquegc/arcade_1up_black_friday_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jbgVQhi/62683202281.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/zidugadovi.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/gghghhb/bogamugisizixuviguko.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/gpjbkjb/emoji_puzzle_level_49.pdfIn PDF document text
    • http://xozonline.ru/16680067182jgb8o.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/20600976030.pdfIn PDF document text
    • http://miwukewemiko.22web.org/95774817954.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duguferebijojo.rf.gd/fosemopaxaji.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/newagawitan.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/kindergarten_bingo.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/7415942624.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/xozuviniporuvozikub.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/suzowulisikazezovob.pdfIn PDF document text
    • http://gipatoxusopupos.epizy.com/template_jersey_esport_cdr.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/46072686861.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_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 5676 bytes
SHA-256: bf3d041e7c166cec1a53282cf5e3080074635f77907e7f345301d61007e9091b
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11816 bytes
SHA-256: 205863d27ffe5d756c5477d9ed389943be8bb21f7cb7b4e28cfa03aa9cef5b42

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