Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4cfccc637a93d9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 01:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 161dcf897d4b8de5fe64bd8349057132 SHA-1: a6dc49e3fec0776df97580dec944d722196f8a4c SHA-256: ee4cfccc637a93d9bd50ba5f3ce9ee48f0e1864eb356d3803712071fbb0e2fb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

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
  • 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://vilenefex.ru/award?keyword=edible+oil+industry+in+pakistan+2020+pdf PDF link annotation
    • http://domainlimax.xyz/ancient_rome_romulus_and_remus_worksheetgwihu.pdfIn PDF document text
    • http://brumbum6.xyz/417813306298kcz8.pdfIn PDF document text
    • http://kofuruwus.22web.org/remutuxotuxoxuzes.pdfIn PDF document text
    • http://nextauto02.ru/970691929606a944.pdfIn PDF document text
    • http://lutefofojonu.iblogger.org/pdf_file_reducer_100_kb.pdfIn PDF document text
    • http://meriline.store/honda_gcv160_engine_parts_manualy6018.pdfIn PDF document text
    • http://mugedly.xyz/86028403721jilaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumugotodag.epizy.com/farm_to_factory_reading_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/bent_over_row_form_scapula.pdfIn PDF document text
    • http://xijuwevame.epizy.com/avon_september_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/gaming_zone_apk_free.pdfIn PDF document text
    • http://turopam.epizy.com/how_to_measure_depth_of_knowledge.pdfIn PDF document text
    • http://notaruk.rf.gd/lutudukepanuwerutigepe.pdfIn PDF document text
    • http://texozokuvet.epizy.com/facebook_recovery_code_not_received.pdfIn PDF document text
    • http://kimogule.epizy.com/pomilaluxotikesumurob.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/chernobyl_hbo_imdb_parents_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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 5572 bytes
SHA-256: d233de3c5d76fa249ab32f574e96468a40f2a34aab294ac3cdd8dda1ce844a9c
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 10988 bytes
SHA-256: 506fea5a0b07c4148d703b31ae626fd29061e91815c7f6d04982a938cded8b3b

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