Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5108f7b89ae0fbf…

MALICIOUS

PDF

66.6 KB Created: 2021-02-21 04:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bca76389eaa185190cbb649edc07b830 SHA-1: 7e89a8297b8a9be282ce2677fe017b58d83ac34e SHA-256: f5108f7b89ae0fbfb02b648f9f50a5926d2283407879950cda0038e80859b36f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

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://bologen.ru/strik?utm_term=cuisinart+compact+juice+extractor+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481397/normal_601b8da69ec3a.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/iFhihhj/fairy_party_plates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6010c7aaf3b28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fc83e5728caf.pdfIn PDF document text
    • http://dakijexok.22web.org/broken_halos_chords.pdfIn PDF document text
    • http://akb54.ru/77710684632z8eyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fd252f068406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_6018719623491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5fc5f295491cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fdf06c77b300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_601af3c74e61c.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/jgqoNdU/nafanejujidagixomina.pdfIn PDF document text
    • http://vandify.com/a_cuantos_dias_se_sienten_los_primeros_sintomas_de_embarazodh979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifowusaw.epizy.com/tekonsha_p3_electric_brake_controller_manual.pdfIn PDF document text
    • http://xuperag.epizy.com/aqeedah_tahawiyyah_english.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_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 5248 bytes
SHA-256: 844f958440d87f46e456a5c742f19077a53a67968b70cd85f5fdee81e7c49bf9
font_01_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 11276 bytes
SHA-256: 1a11c8186b10de95b34558ff29e7601aca8c96fb423466479abfe7b6329b83af

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