Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d232d5c200357d…

MALICIOUS

PDF

104.2 KB Created: 2021-02-19 18:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1d3772d5d780276f29d87bd503fbe987 SHA-1: b97299b3ab3e793326048bf737619d9e394d73e0 SHA-256: 49d232d5c200357d8c249b12fa4b65b150ba951cde023f23af0b27dbac91765f
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

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://maypoin.ru/123?utm_term=virgil+aeneid+book+ii PDF link annotation
    • https://cdn.sqhk.co/foxidagon/V6sEEih/30636983638.pdfIn PDF document text
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/2895048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5fdef27b162b7.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/kobezaxowidesomena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_600821a152ff8.pdfIn PDF document text
    • http://grinallex.shop/kosiwojarotajer.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/OfjdEYh/leap_frog_game.pdfIn PDF document text
    • http://prizinsta24.online/82431739206wo7cz.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/hfajhib/zasipitazuzeguxigeziva.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/xapujefezunu-tenemejukot-penaposuror.pdfIn PDF document text
    • http://flathead.us/pipubikiu8car.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/sajatofubote/93379527675.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_off000160fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FE 4984 bytes
SHA-256: 9ce090a8caed3232145babb6bdbd630e834305ad4079c3681a4fc253ffba4cd0
font_01_sfnt_off00017203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17203 10100 bytes
SHA-256: bd924aee9c38f800e742a41d5c4f7bb358c8dcf95dba50f00285b85b4f85d9c6

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