Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b7fb72c6978a1a…

MALICIOUS

PDF

86.3 KB Created: 2021-03-02 22:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6ab37a33bd8edae34dc5eea03ff6f834 SHA-1: a192a271f35a95641732bb46ae03b35bcb48dc52 SHA-256: f6b7fb72c6978a1a404ade632ae5d5cbec734e002fb34b4af2687d3d7bd5d140
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, appears to be a lure related to a washing machine manual, indicating a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://mezovuduw.ru/123?utm_term=lg+washing+machine+f8068ldp+user+manual PDF link annotation
    • http://navalny.design/batman_arkham_knight_all_skins7wcoe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_60125363b8dd6.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/45e13958754f.pdfIn PDF document text
    • http://mebelintera.ru/dem_hemirelik_bakm_planrd0il.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/0db81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5fca11d794e46.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/vqji1II/tomb_raider_ghost_hunter_missing_one.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/fevetenomus_dosozomimis_segoza.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/bipeg-xalud-guxexanoxuz.pdfIn PDF document text
    • http://kekisire.22web.org/beats_netflix_movie_soundtrack.pdfIn PDF document text
    • https://nazawerud.weebly.com/uploads/1/3/4/3/134353719/safubane_bilujuxebuguw_maref_gibewobupakagir.pdfIn PDF document text
    • http://itanah.space/68473287199wnt5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420260/normal_60055f6f344bb.pdfIn PDF document text
    • http://xikimifo.66ghz.com/legipolatorowukev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizufapu/tree_diagrams_corbettmaths_answers.pdfIn PDF document text
    • http://xufeguwopox.rf.gd/cara_buat_cv_lewat_hp_android.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/formal_letter_for_employment.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/ravitokidufi.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://scripts.sil.org/OFLIn 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_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 6092 bytes
SHA-256: 16c7005d015bdd40233046fa476e9af37baccaba91219e474fac661901500c15
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 11148 bytes
SHA-256: 8f15ac63ee61c813ae666bd277a536cbc281035a8aeb4b26bc9f1fdfd23ca843
font_02_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f

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