Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9807cc566fe2b56…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 19:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96acf5e89951e6c473d651b9cc3f0f3d SHA-1: 63a938db687d2a425c23be6d69e4e9b358cb3309 SHA-256: b9807cc566fe2b56bbcc9c608ef24ac604fcd8a3b10a35fbdf2633d5ea3890de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics further supports this, indicating the document's primary function is to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=pokemon+mystery+dungeon+3 PDF link annotation
    • https://nirkongrp.com/ckfinder/userfiles/files/benume.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/19191587589.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/miwerapus.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kuruxufigem.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/mejetesevax.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/natifoximimabope.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/gugut.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/rebinedapalavuwediw.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zepufoti.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/72298296264.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/60050014586.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/jexemove.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/gedepubopimun.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zonudasudabelevoxoneb.pdfIn PDF document text
    • https://techlan.pl/files/file/tubixomedofevidegadalowe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161386afe85cc9---musawedejavo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/249fvllhrathqcvt15p1dtk4pt/7261513320.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/33481848493.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/73405273498.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/65366754321.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903185531.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_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 10772 bytes
SHA-256: 8bb41eac5a343f1a7f54c5cf3f073cad5d0b7c7b3072fe57735462bd0b56013c
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 18728 bytes
SHA-256: edfe65b3e99644cf8f67431f7f907018416ad21eb2db0fe32d70941568fafb2e

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