Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f32da02da30723…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 21:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e93bb89e9419a3e8b108e33145b6b477 SHA-1: fa129704d1871586a61a8a53d0d1588fba2b2793 SHA-256: f9f32da02da30723957e74f05c081d91e689e2295ebf85c7779da335bd13f529
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs indicates tracking, further supporting a phishing intent.

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 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://pelibifir.ru/aws?utm_term=skyworth+tv+55+inch+price+in+nepal PDF link annotation
    • http://xorabawik.medianewsonline.com/quran_translation_arabic_to_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fe019887ef1f.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/qRidTwp/wuzukimexazobufifuma.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/metodologia_de_la_investigacion_sampieri_4ta_edicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_603e0bb0cbb46.pdfIn PDF document text
    • http://health2health.online/bureau_of_customs_accountable_forms3508s.pdfIn PDF document text
    • http://daddytestit.xyz/4354912789m7dol.pdfIn PDF document text
    • http://idealicagocce.site/how_to_replace_a_belt_on_a_stackable_dryer2uj3r.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/cjb1AEa/65040550123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_604b110800840.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/thinking_in_java_latest_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367959/normal_5ff1bffb704d6.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/Xhejchc/redexobokipok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6058f500d50ca.pdfIn PDF document text
    • http://wugipesirexoxof.mygamesonline.org/2020_esc_guidelines_for_the_management_of_atrial_fibrillation.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gNOmpgH/brain_surfing_2_level_79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fcad6faa87e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/iggh5hd/paypal_prepaid_visa.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/56659374053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5388 bytes
SHA-256: 4aa85ca80eab02456fe4949c70c3e6782297bd6f97abcfeb083794ea5d27a4d3
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 10884 bytes
SHA-256: 5e4b7d7ac1ca53845ea2c5830880612c008f48fef892b51e2e2a6eea69b6fa0e

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