Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d96e1d79525824…

MALICIOUS

PDF

71.3 KB Created: 2021-03-16 09:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fd7c6927e7d08e4edf3cb0fa37ff1759 SHA-1: ee5ffcb2c61ce3dc4199006892f56cc6107c49a3 SHA-256: d1d96e1d795258249c6301c045d8d3454b6aeebd3fbd77f9155306cd76f3e345
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs that point to external websites, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted from this sample.

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://jacksth.ru/award?keyword=biblical+baby+girl+names+meaning+gift+god+pdf PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/ehigcxo/best_islamic_quotes_in_urdu_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/gcLBLQM/jadorigizonuzidabelasawad.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/Ggeics4/15417017444.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/hfgf4LE/guided_reading_groups_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_6009dce786102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5ff1eeb61200e.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/70037450243.pdfIn PDF document text
    • http://gorojivoliw.22web.org/99366695783.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/yigGxjf/15662044938.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/Glctgei/superhero_tycoon_simulator_roblox_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/hf8hiji/8736951897.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/ibMtMhe/corporations_canada_paper_forms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sibubixusa.epizy.com/32353929879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec18887-5918-47e2-8435-0d4292d85601/31821762494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05938c2c-9b8d-45a8-9833-965f8700bfd0/little_shop_of_horrors_plant.pdfIn PDF document text
    • http://rotitow.rf.gd/90783601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd958e24-a61e-4e5e-a2cb-f1e43f3c021a/envision_math_grade_3_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225399bc-8b39-4873-b334-d2d43c825034/65179212869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738fefc0-a0c4-4284-893f-7ad1ebcb9bad/95255394267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e618cc5-cf2d-4ad9-881e-fea49191025e/how_to_start_buying_stocks_for_dummies.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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 5768 bytes
SHA-256: eb149070b2f3c54afa55599aca180b3847a673a9cd8bb8fc088b4b927c00aa76
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10332 bytes
SHA-256: a4a29cafcf0dbefff9d4e9db327a4c82d406cd77ba4a8df04a608be5eb6b9d74

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