Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a2e01e9e83c624…

MALICIOUS

PDF

71.6 KB Created: 2021-03-07 18:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7cc699b7c54ceb64700a9db3c1c48237 SHA-1: 70eaa4266a35aaa8171d525d3510eed21f3163f3 SHA-256: 42a2e01e9e83c62409e1aa9cf7e68e5285c9e0aa95e1877d647288546cd7991b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to disposable hosting or potentially redirecting domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+tighten+bobbin+tension+bernina PDF link annotation
    • http://de-bewertung-id2842384.icu/girisikimejmko92.pdfIn PDF document text
    • https://cdn.sqhk.co/poxudanefisi/Ymenyif/risk_neutral_probability_option_model.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/similarities_and_differences_between_arteries_veins_and_capillaries.pdfIn PDF document text
    • http://wavepolabipal.22web.org/32308448032.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/ijiluii/90328343688.pdfIn PDF document text
    • http://cccckkkkkdd.space/gijoduxyxszk.pdfIn PDF document text
    • http://instas.site/bidoserukejaxuxonzg6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funuduki.rf.gd/systems_of_linear_equations_graphing_worksheet.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/what_language_is_neither_indo-european_nor_uralic_in_origin.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_90c69fe2a43b4b55a2da30dcd9d8426a.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/does_jared_do_ring_resizing.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_63b459bd9c024b52a33aa4d6bdabea65.pdf?index=trueIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/weveruwu.pdfIn PDF document text
    • http://xevisovuf.epizy.com/75022039380.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/bakigirunigafodatazed.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_49aeda12f6324d85ad76990d4a3dd22e.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_976f5bef2877435496cab9b6e9c671cc.pdf?index=trueIn 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5108 bytes
SHA-256: 914dd9fe2d2d3ffb4853aee13471f81258b513ed683bd83c321c2b172449b3b6
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10348 bytes
SHA-256: ff79823e79bf9c68c04357403ef67ff9eb480f685c32f9facb3a5d6993b3afdb

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