Malicious PDF — malware analysis report

Static analysis result for SHA-256 71680e869e5a9139…

MALICIOUS

PDF

88.5 KB Created: 2021-01-26 22:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c00369bcfb18b5947946924dc87dfcca SHA-1: b0ce98895159e2f8ec0297c5cfb10c3c73811328 SHA-256: 71680e869e5a913969dbac322b006203767a73780bc9c9d1a13ccafb9fa19937
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm on disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=shostakovich+symphony+5+piano PDF link annotation
    • https://cdn.sqhk.co/pezolaje/jcWjJaV/live_wallpaper_iphone_ios_14.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/konoguzuwivefon.pdfIn PDF document text
    • http://dewiwusuxutez.iblogger.org/newsletter_mailchimp_template.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/tamale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_5fca0991a2036.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/bizutonat-gasiz.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/gi5ii7t/35685008414.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://jexusapije.epizy.com/nivejanademujizudi.pdfIn PDF document text
    • http://numivonef.rf.gd/96899701778.pdfIn PDF document text
    • http://vedelobezab.rf.gd/solakowasufesimujodoz.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/tcs_managerial_round_interview_questions_and_answers.pdfIn PDF document text
    • http://pabaxonewopux.epizy.com/kupaxujejakogaf.pdfIn PDF document text
    • http://mewexudidis.epizy.com/brinell_hardness_test_lab_report_conclusion.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/70621202364.pdfIn PDF document text
    • http://zaniwemikadas.rf.gd/kijotitan.pdfIn PDF document text
    • http://ligumawi.epizy.com/12457862324.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 5168 bytes
SHA-256: b70c62926155fcb3dd2144a32fe96d0cc4f785b43d774de50d013a8d1309ba02
font_01_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 11312 bytes
SHA-256: 8407ea7e9bc94842e407e32c4c88e2b3ff22ed52fc00200fbf02c3dc17368905
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd
font_03_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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