Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b542f6f7d70cc3…

MALICIOUS

PDF

73.1 KB Created: 2021-10-07 06:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38b574cf802c44552dd7f8bba04df9e9 SHA-1: c458284c74b052860bb664101ca51ad9c96f59af SHA-256: 34b542f6f7d70cc3d12bfdc864f4d3b7a1ed9ecca52069ca17c568ef2db1dd8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Numerous embedded URLs point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=law+of+attraction+lottery+winners PDF link annotation
    • http://koryosushi.com/uploads/files/40314345305.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/49615387729.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dd4dae42d3---35702620701.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/1868756455.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/dojatokuduzidoso.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/niporeligi.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210924_A0FFC35CFB0EBF3E.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/razaxobeveperu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/bepokavogagiz.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/fodotodituba.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/16113686883.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/12673556623.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/60200887078.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/86761051627.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/beguvedodel.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/rugofivifanazugoduwamo.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/8896688009.pdfIn PDF document text
    • http://builderall.info/userfiles/file/romuxaweluxegoretu.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_off0000bc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 10488 bytes
SHA-256: 205a3ee86e096d7b720a84c55852ea7026ffe7ea05e5eacb5013a13e6d1c07ff
font_01_sfnt_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16740 bytes
SHA-256: bcf31960f4d5143c6626a8fba7f68c3ace59676f4ea049509654ffcf73e88008

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