Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a699f9815cc39d…

MALICIOUS

PDF

82.0 KB Created: 2021-02-27 15:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: aff6213113cbcbbd1b2067c80034d94d SHA-1: 5511555de65737e1e63e73bae101444e305eb86c SHA-256: 75a699f9815cc39d7758d0902c6c3315ef556a2a872abf2cb152461aa5a7463a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded URLs and is structured as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to downloading software, reinforcing the malicious intent. No scripts were extracted, but the PDF structure and embedded URIs indicate a phishing lure.

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/wix?keyword=download+need+for+speed+most+wanted+apkpure PDF link annotation
    • https://cdn.sqhk.co/vipatajase/hhesrDU/wisaxexifiwaruwexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6038498a40e1e.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/7ijhyjf/22146866668.pdfIn PDF document text
    • https://cdn.sqhk.co/vekotevudoze/kChepif/31504531801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225cf4de4c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/5CJY5gg/48488308402.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/a_method_for_prayer_freedom_in_the_face_of_god.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_602b63e86ee1c.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/igCUohh/14729499029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f77eda8a8.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/fun_run_boosterthon_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_5fc68b7c216e5.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/satezakojedipa.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/cgd9kgj/vemibojofabepebojuxiguwun.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/fSFaicM/cabify_mexico_conductor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomaxod/18845008920.pdfIn PDF document text
    • http://jemileti.atwebpages.com/xobumubaguxifivesobat.pdfIn PDF document text
    • http://satuvet.epizy.com/autothermal_reforming_process_flow_diagram.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_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 5344 bytes
SHA-256: 1d278b9f578131d15888780bfb4fc461c70b7de000cfa1c6f56444c786a8f774
font_01_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 10524 bytes
SHA-256: d1db2b7a4d957619998e40d73caf8be6836cb70aab7177b68e552e7c4464efa4

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