Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed494d359f08b55…

MALICIOUS

PDF

68.1 KB Created: 2021-05-08 01:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 92c9821bf066f9e56b7c1efe2bb1f5f4 SHA-1: 860176b391e930193284c9508bec92b599387190 SHA-256: 5ed494d359f08b55c2af6a2ff75b6c4c7e8126eb7ca9fcaa74c5cec580c514dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://pelibifir.ru/strik?utm_term=wordly+wise+3000+book+9+third+edition+answers'. Heuristics indicate this PDF acts as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/strik?utm_term=wordly+wise+3000+book+9+third+edition+answers PDF link annotation
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/acidosis_metabolica_pediatria.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/aneurisma_aorta_abdominalis.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/XOib7nL/app_for_more_followers_on_instagram.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/dokotediwuzabo.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/funny_icebreaker_questions_for_work.pdfIn PDF document text
    • http://hot-money.fun/dcs_5020l_troubleshootinghqeeo.pdfIn PDF document text
    • http://malespw.xyz/50936579080u9b0i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5ff31eb4b68b8.pdfIn PDF document text
    • http://trells.space/menolusobafixupugwkfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5fe0bf04de138.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/higCidr/wenopozemowizimifuma.pdfIn PDF document text
    • http://copyright-notice-ig.com/the_crown_season_1_episode_3_wikipediafbdy2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fce1fa2e28d7.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/kozibowisenatu/rarakogoponisipodiladuru.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/felalupidogiki.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_a1de7c40ac474b29a327d975265d076a.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_43a467e676564bc9869b3ec15370e33a.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_450a5b85c53e4c08b61539a51fa2b2f8.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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 5784 bytes
SHA-256: 53d5b155996aa16ac3b69caedf9fb2ed57404754c465a90c57fbfddcde2fecb7
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 11564 bytes
SHA-256: b26765a34bb15accd33df184da8730837fc94d95389e37c7f4aa0973ddd6e80a

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