Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb67af6774ba8f5f…

MALICIOUS

PDF

68.4 KB Created: 2020-12-09 11:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 17130166f231b4bfb0127cbc85b7a719 SHA-1: beadbd74e245506ab45544cef352e8e05c8e3444 SHA-256: cb67af6774ba8f5fcd0afa181c48af95c9b1e1c87bcce1b580961b165cf6afea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one primary malicious URL identified. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://traffset.ru/strik?utm_term=chemistry+1+chapter+7+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fc4f7f5aa9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5f9f838fd4d1a.pdfIn PDF document text
    • https://simavaxefawok.weebly.com/uploads/1/3/4/6/134666246/maluxomadepazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5fc3ffa528132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc67f67ab79f442f2500a09/t/5fca14b7d7c3040d8738055c/1607079096604/spinach_recipes_keto.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/amon_amarth_berserker_blogspot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce111f3775b77c105e468f/t/5fd05736ef76c20f2d463ce9/1607489334670/redbox_promo_code_free_rental.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/pyridine_alkaloids.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fcc08580ab5d62febde9494/1607207000976/tavuzelomalulazagili.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf99ab474932ca2675888/1606220186062/transformers_forged_to_fight_ios_cheats.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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 5592 bytes
SHA-256: 27933bf8be19c0e3e27697dd52e20c01d3f5e5e064968b6c74bc08b8944e174f
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10396 bytes
SHA-256: 90cbfcaf7c0fc804713f5517b8eecf72a063e52114991dccf4fff9cb3d57779d

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