Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8426e51b517f29b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 13:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c70a3d1a9b67963a9a59c6fbc5beffb SHA-1: 04fea980a671529859241d1e3de39b607ce285dc SHA-256: c8426e51b517f29bee0e4d8361c43bfcfe7150dcab4f04d9ceafc99b1c355a3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure itself does not contain readable content, but the presence of embedded URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=last+origin+apk PDF link annotation
    • http://cjmfgxfollow.morefriendship.com/upload/files/27810412814.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/27628778729.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/24219323177.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/judisamemanoves.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210915140321.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/92617221763.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57a738b6e305bdf08db77be01d488d68/81345897827.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/mogaterox.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/nopopi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/kopolidilu.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/52284241357.pdfIn PDF document text
    • https://phukienbep.net/media/files/98310853597.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/66843217237.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • http://idcla.net/upload/files/detibozixotoz.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/vamumiveranusulusafizi.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/keguraxewidaridifu.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f8cff7670a47091a51445a3600fc873e.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gusefubibefonizuf.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/davunuwej.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/92692135877.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/puvemaze.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/78425701890.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/16107279864.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://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_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 10296 bytes
SHA-256: 83b62dcdd062e74569cb99d28b119aaf76205142316065c7868eb8d4500eb032
font_01_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 17172 bytes
SHA-256: 6b2667227c87152e6b393182a5e23756fdd1d9561441a068884fa8074efebb7c
font_02_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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