Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f34fa31beaf5f1…

MALICIOUS

PDF

85.3 KB Created: 2021-02-26 11:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4e5372f350aa3c12ce331f77ca8b8ebc SHA-1: e3fdc9dedda4793175e9c689dd1c21c4cf74d145 SHA-256: 82f34fa31beaf5f155556a72bdd08a4775c03c5fbe5695ad4a546b9ced3dd0da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=pride+and+prejudice+1995+watch+online+with+subtitles PDF link annotation
    • http://riwotivadejud.sportsontheweb.net/zeperede.pdfIn PDF document text
    • http://duplicwcnj.space/divine_mercy_novena_day_8m76sw.pdfIn PDF document text
    • http://sks-expertiza.ru/rule_9a_massachusettsljv3j.pdfIn PDF document text
    • http://cenderaoriginator.com/subway_surf_para_hilesi_indir4tejz.pdfIn PDF document text
    • http://migriruy.ru/learn_chinese_characters_with_picturesq3rbs.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/xewimafegen_makebokiso_bolurefawugu.pdfIn PDF document text
    • http://criticcxck.space/pictoword_level_450jb3l9.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/6e55dda.pdfIn PDF document text
    • http://zabavnyi-slon.ru/kunalogyukrg.pdfIn PDF document text
    • https://majosipodolonax.weebly.com/uploads/1/3/0/8/130814003/404936c47.pdfIn PDF document text
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/c884e5fc06fa.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/kimikuvusikeke.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/new_practical_chinese_reader_2nd_edition_workbook_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/what_is_the_maximum_weight_for_a_baby_car_seat.pdfIn PDF document text
    • http://lugirike.epizy.com/uric_acid_diet_chart_in_bengali.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/pakistan_criminal_law_journal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 5804 bytes
SHA-256: efc6372cd8436e5543e966ad7c897cd55d11643795a739dc2b1275619fec8f4a
font_01_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 11108 bytes
SHA-256: d59086d5c56768b58c186430ee751325c555de7a7325129348bd8a232ba073ff

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