Malicious PDF — malware analysis report

Static analysis result for SHA-256 e546a00d6a3c57aa…

MALICIOUS

PDF

69.9 KB Created: 2021-10-08 18:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bdd0926f73724edab0ac1071bb0132fe SHA-1: 7472aa3e2aedbe10c52a705ee06f57946193f982 SHA-256: e546a00d6a3c57aa5b6f261c68d1d28198b62eeae2816efedfc82fbcfd7ba6d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The PDF structure and embedded content suggest an attempt to disguise malicious links, aligning with phishing or malware distribution tactics.

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://irlanc.ru/uplcv?utm_term=sudden+cold+chills PDF link annotation
    • http://rinsacars.com/files/others/17875176.pdfIn PDF document text
    • http://muszempilla.com/files/file/34646860005.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/fijadifaxofit.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/21519122057.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109130122503271.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/81637657954.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16158957167f57---veguxudenatop.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/xokagemixe.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/64021202207.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/94697717963.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24613317732.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/43624193303.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/mevemaxeladudo.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zixaxulorikepuk.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 10280 bytes
SHA-256: 2ab1be854fd52671637394d7738f4998a667e0d8d819378c9b006299f091786d
font_01_sfnt_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16036 bytes
SHA-256: 68fd615ce4c1f1f24dd8463461bf7c431e9fd0d4e01063b8b5dd03fffa4c0f0c

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