Malicious PDF — malware analysis report

Static analysis result for SHA-256 de955621b6857a01…

MALICIOUS

PDF

85.7 KB Created: 2021-05-31 20:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdfa2c38112f1bc16e93a383efcb32d SHA-1: 26d52b15fabe1a4b3fdc1195ff9f15f7cab4b8b2 SHA-256: de955621b6857a01ea22cfb8ad7dc5ec47dda6237ff7f120d0d1399da126d096
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of embedded external links, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=best+buy+tv+antenna+signal+booster
    • https://cdn-cms.f-static.net/uploads/4368496/normal_60513a04522e6.pdf
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/nikevanisugimaka.pdf
    • https://kadenuwu.weebly.com/uploads/1/3/4/6/134674874/4492406.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_604033f065ec1.pdf
    • https://cdn-cms.f-static.net/uploads/4411218/normal_6037cbfd87e0d.pdf
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/deluvozituxup.pdf
    • https://cdn-cms.f-static.net/uploads/4411931/normal_60639ecabd3f4.pdf
    • https://cdn-cms.f-static.net/uploads/4475852/normal_6057120783d76.pdf
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/lolinemitutumos.pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_601e904b73b7b.pdf
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5ff5c037938bc.pdf
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/1504252.pdf
    • https://cdn-cms.f-static.net/uploads/4482418/normal_606947a5193c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a1dc70d-b2c6-4849-b824-31f7119e69e0/how_would_you_describe_the_climate_of_this_region_as_suggested_by_florus.pdf
    • https://uploads.strikinglycdn.com/files/ecb8338f-1c2d-4800-8b61-3fe75d2a708f/ford_escort_mk1_felgen.pdf
    • https://uploads.strikinglycdn.com/files/11c1411b-62ba-4ad3-8867-10534215680a/5000_circuitos_integrados_de_amplificadores.pdf
    • http://botinuba.pbworks.com/f/25788680574.pdf
    • https://uploads.strikinglycdn.com/files/1d844a80-d319-436a-9490-fa8804de0c5a/jaipur_national_university_mba_assignments_answers_101.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144413640/24103315903.pdf
    • http://negovijalulu.pbworks.com/f/33720231370.pdf
    • http://tukufidanega.pbworks.com/f/supplier_satisfaction_survey_template.pdf
    • http://xujefix.pbworks.com/f/sarusuvibukanekaxijokur.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144422439/pimawovunipiwuwi.pdf
    • https://uploads.strikinglycdn.com/files/242d8447-0532-4958-9111-43599de53ad2/drinks_to_mix_with_crown_royal_black.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f1.bin
7994c347cba99bfa33289d6ef6b5ee81d11c80db458f0c18def7e60972165490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 5204 bytes
font_01_sfnt_off000122c5.bin
0eefccd211f9560f840cd9f165095d1704bd82944f9ff9d268a0623f0897bcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 11372 bytes

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