Malicious PDF — malware analysis report

Static analysis result for SHA-256 02875f3df425b41d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 06:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6f2fd22b0c5db261462665b4eb1d704a SHA-1: d91a9edae3e5c12a906bb519421adfe62f813d8a SHA-256: 02875f3df425b41d05ceb5f4f52a609b6f981b042fd74ecf5c4d1abe0f2bd50e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 trojan. It contains numerous embedded URLs, with one pointing to 'jumiwimov.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent.

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://jumiwimov.ru/123?utm_term=dauntless++size+xbox+one PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496402/normal_601bc804e0790.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/02ggRIR/rivals_at_war_firefight_mod_apk_offline.pdfIn PDF document text
    • http://tertov.xyz/sapovejunoridosiveboxaftym6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_603c1926a85cd.pdfIn PDF document text
    • https://cdn.sqhk.co/zirixegip/Ijdb3hj/92178734039.pdfIn PDF document text
    • https://cdn.sqhk.co/kanonilabepi/ohjQvsh/shelter_insurance_agent_login.pdfIn PDF document text
    • http://zubiki.top/117950741539n5mb.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/do6eiiQ/air_traffic_controller_salary_new_zealand.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fcf3e3c2eac5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_46423de9335f45649799ad6673523c6a.pdf?index=trueIn PDF document text
    • http://judiserod.onlinewebshop.net/how_much_does_it_cost_to_fix_a_samsung_chromebook_screen.pdfIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/fundus_albipunctatus.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/winkeyer_usb_manual.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_f77b9de04c50470c82ed5dd7ae2617c6.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_3ee1263adcea4cf1a995142aaf24feb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/bleacher_report_live_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fininoxanef.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_066fb87dbd02464aa772ee5cf0686540.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 4840 bytes
SHA-256: 79d2b4694dc42b1711d99f3e4646374cb8ec22c6043476fc1b00436941853414
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10476 bytes
SHA-256: f2c7b4484735d4b6559d65c10f53d911cf207c57c81bb425aa71d0ffd7a51af1

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