Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b02dd5cebc72bc…

MALICIOUS

PDF

72.1 KB Created: 2021-06-02 09:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc7f3328fbab39ffa49406dcbe3775e SHA-1: d9d1136894a39d8e4f51f3c1e12be2bd52e47017 SHA-256: a4b02dd5cebc72bc40b43e6ba0acafe18f3031f41b5ef1c7a12cdd683bcc7583
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'https://leonvi.ru/123?utm_term=free+printable+croquis+templates', which is likely the primary lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'free printable croquis templates', suggesting a pretext for directing users to the malicious URL. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=free+printable+croquis+templates
    • https://ledomibab.weebly.com/uploads/1/3/4/8/134858948/ziveza-vamoxazafoxigu-gopipofotenitoz-jinepob.pdf
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/lelanaduk.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/9865552.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sozakuvepar.pbworks.com/f/letodivux.pdf
    • http://kivupored.pbworks.com/f/natupuwebamavurap.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144439200/libifejaxig.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144483489/comment_calculer_la_longueur_de_la_hauteur_dun_triangle_equilateral.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144427158/yaris_2007_service_manual.pdf
    • http://tagexoba.pbworks.com/f/devipefe.pdf
    • http://kinuwibe.pbworks.com/w/file/fetch/144444708/49766683011.pdf
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426855/gta_san_andreas_cleo_mod_apk_v2.00.pdf
    • http://jobojifitin.pbworks.com/w/file/fetch/144454692/chemical_equilibrium_le_chateliers_principle_worksheet_answers.pdf
    • http://degenazi.pbworks.com/w/file/fetch/144478611/plantronics_c052_headset_manual.pdf
    • http://mutatalibo.pbworks.com/w/file/fetch/144427311/renobenebavijegifodevuj.pdf
    • http://vimadutukad.pbworks.com/f/rateludolupopave.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8f.bin
a86fff9c70e3d2f7ba446d1a19139336edd17c55294141ab85cc55e1f2a91b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5300 bytes
font_01_sfnt_off0000ed7f.bin
e18ae33c7035ed7835708be392831ec3a1cf7a5b871f1dd4afc86fd80229eadc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10740 bytes

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