Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d92b341f7487b4…

MALICIOUS

PDF

97.8 KB Created: 2021-03-03 12:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7069eab278018e78c9d5887687fcc640 SHA-1: 1f565dc459f090686a9c66e569ee03e1be9dfb75 SHA-256: 92d92b341f7487b43f96cba4239693de72d02d25f56239bfead0e5e776da0988
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=can+sex+offenders+go+to+state+parks+in+texas PDF link annotation
    • http://mosuxuvemuzuwex.mywebcommunity.org/how_to_use_google_maps_offline_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389354/normal_5ffb4a8576b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_5fd98c5e207c0.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/sigA7h4/badonelas.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/Q0icij7/wifi_drivers_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/cYJRzrN/47764366609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_6012187b67925.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/ms8icih/18592462757.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/BFiewhf/abc_news_today_nyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcd7190e5fdf.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/65223641361.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jcqaie9/dragon_king_fishing_online-_arcade_fish_games.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/how_to_bind_a_hardcover_book_with_string.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_60355f1775b58.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/pexodugosa/xforce_keygen_autocad_2018_windows_10.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/97778469147.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/sig_sauer_p320_holster_safariland.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_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 5216 bytes
SHA-256: afa994df2fa871b5e03798c29799927b7c0e143090df94c9d1dbb970dca1cf75
font_01_sfnt_off00015510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15510 10688 bytes
SHA-256: 6bfcc30bc4f05e055be8ddef9c23a30a2ec52be8a4c76e60f7ddb628527206d6

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