Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ed33942fbfb9f4…

MALICIOUS

PDF

104.2 KB Created: 2021-03-11 00:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c35b1678b6b58993333b0d36015304a SHA-1: b8c4673a8b15bcb1a6784f4e3b8a12c8ba8439ea SHA-256: f2ed33942fbfb9f4af7a20be95167b6d21a148145aa63b52e8ff1c194c121c32
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with a notable heuristic indicating it's a link farm on disposable hosting. The primary malicious activity appears to be redirecting users to external sites, as evidenced by the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

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://resalured.ru/strik?utm_term=the+magic+school+bus+theme+song+roblox+id PDF link annotation
    • http://beremoter.online/vumubozeviw8gcrr.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/hTlSyjh/68987867395.pdfIn PDF document text
    • http://katipef.medianewsonline.com/kixogamemev.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/ihmrSX3/star_wars_x_wing_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/jegxWZo/tic_tac_toe_multiplayer_noughts_and_crosses.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/69465859491.pdfIn PDF document text
    • http://mainsale.pro/systematic_theology_volume_1dmri5.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/text_file_to_html.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/daddy_poem_sylvia_plath_essay.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/59287893035.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/eEzifhd/braves_ballpark_name.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_b5e0a6c37ace4342a4e5cb5590766b23.pdf?index=trueIn PDF document text
    • http://vedixemalirugi.atwebpages.com/how_to_connect_my_canon_printer_to_my_computer.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_af5bee9cf5e74d119a07297d855a86ad.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_01fd926d5ec546939be903be20a923c5.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_049f16476f3c473aae451e4e8e8e1238.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_off00014bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BED 5508 bytes
SHA-256: 70a88d166c4e5810495344fe67fbd38ae6e4ea6b5ea8d2af255fe9d90f9b838f
font_01_sfnt_off00015e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E75 16396 bytes
SHA-256: dc25f8a70f0e33a8a0f9b960396b166c1346793dd8e99a14e622323bb7d11325

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