Malicious PDF — malware analysis report

Static analysis result for SHA-256 da85134a76d1103f…

MALICIOUS

PDF

71.2 KB Created: 2021-02-22 06:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c1184e84dde5df32ed216e29e9a6ed9a SHA-1: b3a71f5c11012dae2f6c13529acc87a5f0ceae90 SHA-256: da85134a76d1103f599b679ceaadf76d497d9a82b240bbb2ee600b90cdcc646a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV detection further confirms this, identifying it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=romance+of+the+three+kingdoms+14+pc+trainer PDF link annotation
    • https://cdn.sqhk.co/fagaxirupunu/gendT5H/mod_apk_among_us_hack_always_imposter_download.pdfIn PDF document text
    • http://autocredit.moscow/vezozajuni7ezq2.pdfIn PDF document text
    • http://homeolimp.com/guporji7tp.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/dmawihm/free_get_apple_iphone_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_601e4e4b5a5c1.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/koxotamozuzagebofakeka.pdfIn PDF document text
    • http://lazadacostumercenter.com/834648702990igo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/ikd8jaF/map_of_san_andreas_fault_in_mexico.pdfIn PDF document text
    • https://dofixojibol.weebly.com/uploads/1/3/0/8/130874360/tetusitejowin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff718dc19ff0.pdfIn PDF document text
    • http://gayerkan.com/kpss_ders_notlar_indirvbrrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602f1011bafc8.pdfIn PDF document text
    • http://pemewozeresozo.22web.org/informative_speech_outline_example_about_a_place.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojexigubobe.epizy.com/9317678881.pdfIn PDF document text
    • http://nupepepasis.rf.gd/jofiz.pdfIn PDF document text
    • http://galapeb.epizy.com/butterworth_filter.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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 5748 bytes
SHA-256: 202e9084632100aee87a2055e5dd1e3d38c6a455d8badfacc7ff5540069e250f
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 11412 bytes
SHA-256: c430eb8f34b2a06a910120a69f1c074b6d366a03588a20f9d3b9f001a47fcab4

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