Malicious PDF — malware analysis report

Static analysis result for SHA-256 28490abd8bd8c295…

MALICIOUS

PDF

80.2 KB Created: 2021-06-06 07:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2da343306c45cd245878bafcc654f9c3 SHA-1: fca63451ac111f432a3a062b5ccbfe970574ab27 SHA-256: 28490abd8bd8c2956214600bece94bec461a905cae4fbbc97e334d436e70dad0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though heavily obfuscated, suggests a lure related to purchasing a sofa bed, which is then used to redirect to malicious URLs. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/pbw?utm_term=how+to+buy+a+comfortable+sofa+bed PDF link annotation
    • https://wuwusafofe.weebly.com/uploads/1/3/4/6/134619260/nupifilelaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_605f3b651714e.pdfIn PDF document text
    • https://xeponadutowa.weebly.com/uploads/1/3/4/6/134612209/bejuroxijit.pdfIn PDF document text
    • https://dobuxavebixeli.weebly.com/uploads/1/3/4/7/134725246/c48812e0.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/1d6a4.pdfIn PDF document text
    • https://tanutefezuje.weebly.com/uploads/1/3/4/4/134437554/b8ad9191b149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447271/normal_6004f5d2d18d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_605d1b6c59602.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/d750dbc50.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/84bb4a96b2ab2.pdfIn PDF document text
    • https://derivasip.weebly.com/uploads/1/3/1/4/131407068/retusuvarobukumira.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/sozakazaxubepop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepazonavu.pbworks.com/f/lojabadotedimawirile.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/gameloop_pubg_sensitivity_settings_2021.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/51885233668.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/13448839515.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/98852946120.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/12445090615.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/refojimokifufizetir.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425631/is_a_crystalline_carbon_allotrope.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_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 5460 bytes
SHA-256: 6b6c82890379035a9e80e18973955a0099dde83221f8c6a533e758b0247339db
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10944 bytes
SHA-256: 4431d9340c33ac439e912972d01bedca28cc6780e7118e7b31704363fad85bf8

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