Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15e2119548baf71…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 13:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7a72f1d88c1829861f8b446e28a72fd SHA-1: f36f9221e24132cf05933736dacf307ecc365884 SHA-256: a15e2119548baf71200ebf3dba9701edd902f5843f75283e234136d75205bea6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://denprokhorov.ru/images/file/92409906536.pdf In PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/67822666313.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/5539107137.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zukovututopujep.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/jezobip.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94068686147.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd23a110---94991616920.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/27492495756.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zujavaxiw.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/pezonilupomewekax.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/kalusipivowaxosawot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d14e2ea2c---feveriwefe.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vejiwedem.pdfIn PDF document text
    • https://o-dance.com/upload/files/tawipetipeniritegelajaw.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/6762692689.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/dilikozafo.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tixepujono.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902170555.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fimaxe.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vofoloz.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/galuxagatisuva.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/13310420401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2xl+supercross+hd+apkPDF 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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 19768 bytes
SHA-256: d4c1da8ed17667dec58554fa72141148eb3b69c1a95e880c249ef3b4b6b1a0d6
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 10636 bytes
SHA-256: c575164c0e764a43005e88451345b7fce071b2f21638fe51ec2fc91843f63f94
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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