Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc26976ad188ee8…

MALICIOUS

PDF

74.9 KB Created: 2021-02-27 15:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c07cae1aa254f5c5004ca583de660078 SHA-1: 9b74297a112f880e6c9ecaeaf6ad92a76336e0ca SHA-256: bdc26976ad188ee87f5bc0b0aa8050be1d373315b7432f6f23e2a68849671212
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/123?utm_term=why+can%2527t+i+feel+empathy PDF link annotation
    • https://cdn.sqhk.co/jobubexivex/ehafig2/98039789516.pdfIn PDF document text
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/7639933.pdfIn PDF document text
    • https://cdn.sqhk.co/tidaxetosi/h20havh/basoxijipa.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/bemijeto-lafuvo-fiwetifufo.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/vomedo.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/roribofiloxokuto.pdfIn PDF document text
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/sikibegebopiva.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/ijXaijd/84987759587.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/lanozeximenepuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ff589f94a2b5.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/5bee4a.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/jeY4Uib/pottery_barn_baby_furniture_uae.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/wanimeja.pdfIn PDF document text
    • http://klyshsheff.xyz/bixefifosakuguwiginipoemof7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezibinevuzeliw.epizy.com/interior_decorating_salary_dubai.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5128 bytes
SHA-256: 74a7bf42d239ddf65327391765f4e20d5c6e48a77a7e62760819bbbbb8ce291d
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10360 bytes
SHA-256: cf1d0cf979145e9eef42457203f5df91acc682ce8bbbc475f1b1c7ba215a3a87

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