Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a0e86d255ee514…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 10:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 10ddcd463bd675888cb001daae1796f0 SHA-1: 59d8ecd7d31848514f28b3e7646bd2baddef464f SHA-256: 04a0e86d255ee5146d8e0ef230966a82546ba8a6a3a064348f76d4231fc47578
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a primary focus on 'https://dugedepap.ru/wix?keyword=expresate+1+pdf', suggesting it's used to redirect users to a potentially malicious site. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/wix?keyword=expresate+1+pdf PDF link annotation
    • https://cdn.sqhk.co/felebamifuk/rfqpngf/hollywood_best_imdb_movies_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_603c584b569a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff0d48113630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_603ad4c52fe2d.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/KBDyieC/fazozaxasibibe.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/qFjamic/69703772130.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/municipal_solid_waste_management_ppt_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5ff906d9c22bc.pdfIn PDF document text
    • http://texewofe.22web.org/how_do_complex_sentences_engage_the_reader.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fe16b19cb5ab.pdfIn PDF document text
    • http://reduslimitalia-official.website/faganolxi3sh.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/finaxajazimzi5nc.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/ad70shc/pagevegugilizanewejagupir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6051aef57c49a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofanukeguwul.epizy.com/jogovisamori.pdfIn PDF document text
    • http://sefatefa.epizy.com/46511024450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6000f0-4130-4657-ae75-721020b01305/lowubagowelobinezozeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416acdee-0eeb-4294-952c-c3c21f3c85fa/dell_optiplex_9020_guide.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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 5080 bytes
SHA-256: 3a2a62c62b7337e36a7a80659dc23ab6e857ada53c5ba7e673cfc0657909172d
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 11860 bytes
SHA-256: 38eb75ff2c395c65cb1cffc45626635910a86f5332e5b9f86b79b58e8d104428

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