Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a679376ecefba…

MALICIOUS

PDF

76.6 KB Created: 2021-05-12 12:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f3a1090d17c87efda3b18940fcc43a52 SHA-1: b0b674a7f7d3de143033c51d93b1f617f2c9bb99 SHA-256: 098a679376ecefba23d45613b8caa8cf7fe9fdcd29f5c8fe3cdf12daba1e38ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of potentially malicious links. While no scripts were explicitly extracted, the nature of the URLs and the detection signatures suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+spot+treat+a+pimple PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://limecash.xyz/what_is_the_difference_between_mn_real_id_and_enhanced_drivers_license0tq17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_600138ccdde0b.pdfIn PDF document text
    • http://eurosett.net/221550220097dek2.pdfIn PDF document text
    • http://unityfree.xyz/293586583225yj8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_603c3f6c6b7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_602643613acad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5fe2adf4b319c.pdfIn PDF document text
    • http://bestrongbyg.com/english_grammar_books_online_purchaseyuvgs.pdfIn PDF document text
    • http://9gusevshop.space/89636043812fkmyg.pdfIn PDF document text
    • http://babblescoop.store/lexuzosoxvzh2f.pdfIn PDF document text
    • http://cyberlife.store/how_to_change_payout_on_slot_machine3hcau.pdfIn PDF document text
    • http://tvoyoproc.fun/lunawunopemojebhwx3g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd3577166249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe690da8d3ee.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/olivia_opens_a_lemonade_stand_bookht20z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_0e228223634d40eeb9c0eb0c9af368f8.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_c6f6550669a544b280db04f9a5b29727.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_1f9491b0b5b94ffdbf6c90b2be755795.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_a5a2cd3f750242849060bc42891bda40.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_3c03ef54dddf4df88141b2ea7d6a8160.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_2cb533946c184eb9bd7663d36a9d5251.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5016 bytes
SHA-256: cbffc14a77e907184b45ba7e721712c68e6a48161bfdd89e9dcbab7f5e9f7105
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10900 bytes
SHA-256: 5aa1f1d00051311d460db4e64e06f797483ec1eb2da0a474c01efb63e8a7af60

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