Malicious PDF — malware analysis report

Static analysis result for SHA-256 791b21bc2ac7f644…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 20:26:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e4a50dd5fc85abf00acaf94f8b2d4ee SHA-1: 33b09222d4365c583f0806f403b277a108bc96b5 SHA-256: 791b21bc2ac7f6449e4769cee8799e65e5932434befd40537bf96f97c819f148
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, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically targeting 'georgia driver's permit expires', suggesting a phishing or credential harvesting lure. The presence of multiple disposable domains and link farms further supports a malicious campaign.

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://druttle.ru/strik?utm_term=georgia+driver%2527s+permit+expires PDF link annotation
    • https://cdn.sqhk.co/ditetona/TNKgfuA/25424808249.pdfIn PDF document text
    • http://rubyshup.space/369202809312etn2.pdfIn PDF document text
    • http://pusulij.22web.org/88198673767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_601704c2e37a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_600ba1a9d03f6.pdfIn PDF document text
    • http://9gusevshop.space/60268430905z4uc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fe4fb4ccddad.pdfIn PDF document text
    • http://xodawasolu.iblogger.org/woxapadodenegoxavizagafol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5fe1032152c41.pdfIn PDF document text
    • http://blancer.xyz/petepezoduwotan2dct2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5fe378e81b0a4.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gihcm7N/antivirus_free_2021_virus_cleaner_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/armitage_shanks_s.pdfIn PDF document text
    • http://rolozaj.epizy.com/bollywood_movies_free_best_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/ethical_dilemma_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/dividing_unit_fractions_by_whole_numbers_worksheet.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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5440 bytes
SHA-256: aa3fbe26d34f034c3cfe255242adb57b4d4a874a7ae1642e134203f2c58b2ab3
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 12296 bytes
SHA-256: 37c2ab3f2e71eb9e0b5fbdb4d60bf55860bdd7aed06f1fb11f806df6d63339d3

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