Malicious PDF — malware analysis report

Static analysis result for SHA-256 135cdbe48b543860…

MALICIOUS

PDF

100.8 KB Created: 2021-02-28 11:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: be6e51238cac9c91f310490139ffe708 SHA-1: d04815d7eb40d434d2f65c3823c3ff278cacf0cf SHA-256: 135cdbe48b5438606bb4829a5139e0cf3b3d74c01c5ccb7a8785039755eb4fed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly indicate 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://dugedepap.ru/strik?utm_term=conrad+heart+of+darkness+amazon PDF link annotation
    • http://digitalliteracyinstitute.com/rocket_league_cross_platform_party_switch5jpz9.pdfIn PDF document text
    • http://timecodes.net/relumazenizuvisitexig7936.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ythiSk8/influencers_in_the_wild_private.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fdd9e322bef1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388629/normal_6004985f31775.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/46647801310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_601b6d48c56ba.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/73465449787p8l63.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/gjkvehg/wuvinazotor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6036bf441bfcb.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/fifria1/hot_rod_lincoln_charlie_ryan_original.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_60344f11220c9.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/zobuwubedak/98604185349.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/daforovufexo.pdfIn PDF document text
    • http://rarifefivafew.epizy.com/wejuterinore.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9E 5136 bytes
SHA-256: 26b494428b39ce18b86b9f415e5de23533058cb3fd9680f9ae9c29a6b0a418de
font_01_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 12652 bytes
SHA-256: 5d836b2a562ce0ff37306c4a07087d3c12dde6c442cac0239a56852fc4fa91ea

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