Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d51a25f8463b83…

MALICIOUS

PDF

103.6 KB Created: 2021-02-17 17:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8942c587dac19fbd027aabd6f152b9b2 SHA-1: 255e56c2f4def3c1f4d98fba69f9b5024c434e07 SHA-256: 86d51a25f8463b83e15788b563f4e4d373a1372c1c1de2d7f4100c2347d12976
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or redirector attempt. The document contains a large number of embedded URLs, many pointing to disposable hosting or known malicious redirector infrastructure. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=when+stress+concentration+factor+is+ignored In PDF document text
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/70a75432.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hhWVhjj/53452502977.pdfIn PDF document text
    • http://pizetagudagunox.22web.org/zukedanewo.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/komeduwunemawax-lonopegokak.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/ieMX4hh/zombie_hospital_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601fb910a3c32.pdfIn PDF document text
    • https://vuzigalami.weebly.com/uploads/1/3/5/9/135960382/numike.pdfIn PDF document text
    • http://tijijosopake.22web.org/english_arabic_keyboard_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/yiaYTHE/flix_movies_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378641/normal_5fdcb7a428343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_5fd0d704d7f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fd13340df2bf.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/baby_shower_celebrity_baby_names_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwedafi.epizy.com/11945387655.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/12019121905.pdfIn PDF document text
    • http://kabexumowexugu.epizy.com/22311551544.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/jolegitonaloduwukox.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/alien_covenant_free_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 5264 bytes
SHA-256: 5765cd9d522fbdca6b2658223d1d3cc84def15518fd7db332375174f7183ea94
font_01_sfnt_off000146d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 15824 bytes
SHA-256: aa958f1a916c986526a3ccf1e091d14a57271d7d03ae09e79264b2e238432456
font_02_sfnt_off00017bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC9 16072 bytes
SHA-256: 535e9c1e792d29cb233fc29248ca2e59ef6f4474113259f0f47c29ee859560d4

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