Malicious PDF — malware analysis report

Static analysis result for SHA-256 42139562e8ef545c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 22:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b1ab4a88972c6130bf880982ecdd535 SHA-1: fe30d09368cd4df7dfe4a0cd492bb957b7a6eb24 SHA-256: 42139562e8ef545c1510f3cb1be554a6157630cd72501672775841a12829bb9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to disposable or unknown domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ineke-ott.nl/keramiek-beelden-imagesfile/supodesu.pdf In PDF document text
    • https://www.thaiahpa.com/flash/files/migewakaxugam.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/78703118115.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rekisof.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/samagikuvo.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/53006137496.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/zikolivemegugimezevujiw.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/72nlgdtapni45tnjgstq0ldj90/90492326864.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemobomaxexalapuvilaguso.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/pakosojinepudo.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/juxifajikaju.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tusevasusaragisigafoped.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/gibigipamegosopuwuwovofem.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/50277695395.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/3238250750.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/76293373169.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/84903196586.pdfIn PDF document text
    • http://sivam.pl/files/file/pipux.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jabotagi.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/valebelefitififive.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3246555598.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/35675432271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=game+gadi+tractorPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 10432 bytes
SHA-256: b9b2c932e731d202f82d3ccf948e8a81192123e65bf3574eec2e69a794156a8b
font_02_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 17368 bytes
SHA-256: 634b56b9722211b78fb61586c468f9cdb6addfe60440164e72e69eda4272cfb5

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