Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e509f8dd83074a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-03 00:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ae6f39488419f7e86e7744aacd2f625e SHA-1: 286a9a140e81915d46539020b619a1841bdb9226 SHA-256: b8e509f8dd83074a97af2d9e58398d93a17faa7d226b2e6d9a9cc6f421ab181c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for execution.

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 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.
  • 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://bologen.ru/aws?utm_term=auto+rotate+home+screen+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448539/normal_5feefbf611003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5feaf1ad313e0.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/vubomef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_5fe64932342f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600bbf535790f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5ffb8c0ccc11c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5fe8fb9bcfb91.pdfIn PDF document text
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/xotiw_dunewara_filomogeverizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jataluwapimose.rf.gd/jurassic_world_2_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/rotak.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/vaste_song_mp4_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/24872492011.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/codex_adeptus_astartes_8th_edition.pdfIn PDF document text
    • http://vevojadiren.epizy.com/barada.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/90371763558.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/94152991355.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/zabikugetelewes.pdfIn PDF document text
    • http://sarososibi.rf.gd/mhw_gunlance_guide.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/xakesenu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 5020 bytes
SHA-256: ed311fbbacb819cdaad3124c6bc02f9dbbcfecc7728784f8ff924ad540099dd8
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 10636 bytes
SHA-256: fb16289cd0dbea87cb586865e7472d9eded32f818a9537846a42da3546e7b218
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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