Malicious PDF — malware analysis report

Static analysis result for SHA-256 a697cceaa894e488…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 19:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 632c18e90c02d118e1855825e369561f SHA-1: b8f9c49ea4aac63c3ec0718ea5a3c4ff6d09ddd5 SHA-256: a697cceaa894e4887438a19968ac4d9cb90f23e78fa1504f2633be2a471cd61c
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary lure appears to be an 'office admin job description pdf', likely a pretext for phishing or malware delivery. No scripts were extracted, but the extensive use of external links indicates a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=office+admin+job+description+pdf
    • https://cdn-cms.f-static.net/uploads/4445739/normal_604cfa53e3503.pdf
    • http://unosital.space/multivariable_calculus_8th_editioncaz22.pdf
    • https://majurunonixo.weebly.com/uploads/1/3/1/0/131070356/71f26a.pdf
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5ffe8462ea922.pdf
    • https://veledagovivavav.weebly.com/uploads/1/3/2/6/132681602/gesapuj.pdf
    • https://cdn.sqhk.co/gujowaxexag/gTybzji/galaxy_on_fire_2_hd_ships.pdf
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/desotum_kituvadunerog.pdf
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/fozijuzevositol_kiletag_zovofakodadup.pdf
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5ff25dc431b47.pdf
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/9ad166ef71e7.pdf
    • https://cdn.sqhk.co/rerunaropiz/igfgduB/2679050745.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/kuzujavojogo-zanowobodal-mipufofejexetag-xajasibiranoj.pdf
    • https://cdn.sqhk.co/novigigexuxo/chajjeD/jisuxa.pdf
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/tedutajowo-tixijezeraf-sulozelow-vijegeja.pdf
    • http://nudistoff.club/star_wars_aftermath_audiobookxdo6z.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_5fdc020152640.pdf
    • https://sarudutedax.weebly.com/uploads/1/3/1/4/131453649/metivufafa.pdf
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/fazabujabiko.pdf
    • https://cdn.sqhk.co/kasuwajavi/aPkjjyf/73412306498.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fepoxojosatomu.epizy.com/98638246956.pdf
    • http://nufeluzuxaluw.epizy.com/nier_automata_official_strategy_guide.pdf
    • http://kaxegukepoxar.rf.gd/25510769945.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_off0000fa13.bin
26556d074719ec5df728639f3e5197536e8cd018a09fb6ad71148d24c611ea2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 5512 bytes
font_01_sfnt_off00010cb9.bin
75eecb55f83f0216d806d7f1afc846f40fecbffa3e8aae243811e26e32269362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 11008 bytes

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