Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d91b0d76a9a59eb…

MALICIOUS

PDF

78.2 KB Created: 2021-02-17 06:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 63523e643cdf1480e6ceda2749e58573 SHA-1: 20278ff9cd43954730b00029a855500adf319afa SHA-256: 3d91b0d76a9a59eb87313c489e524c658ac0cf55c882fd44db45276b4545fe81
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 or trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to setting up a JBL soundbar, indicating a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=how+to+set+up+my+jbl+soundbar PDF link annotation
    • http://detonic-official.website/okami_treasure_guidesa8qa.pdfIn PDF document text
    • http://makamar.tech/230421276747uonw.pdfIn PDF document text
    • http://healthit.space/76074937051k9h1a.pdfIn PDF document text
    • https://natozopito.weebly.com/uploads/1/3/4/1/134108601/lirubusakubis-vasitetajuvumup.pdfIn PDF document text
    • http://timecodes.net/levitu7em7d.pdfIn PDF document text
    • http://douchehq.xyz/85276802903p5xoa.pdfIn PDF document text
    • http://zdorovienashevse.xyz/dr_patel_diseaselessmsqky.pdfIn PDF document text
    • http://netzamka.ru/battle_of_sea_pirate_fight_hileebzlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fd79a21480b2.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/948a8eadfd9.pdfIn PDF document text
    • http://freehookup.xyz/sitevumizodabavimegeroqxht5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajibile/28979313726.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/yugioh_card_print_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/61939679384.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_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 5476 bytes
SHA-256: 3d3b2e013b732f75c87ba5c31b8e055708efe4314a6c4a5180362ae45b5f06a8
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 11168 bytes
SHA-256: eb04f52dd16a5ddf94699e9b84b57d0b6e7436efb9604cc21c365761f897733c

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