Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef8fa628826e81f…

MALICIOUS

PDF

98.7 KB Created: 2021-03-25 14:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 71181726f4eb3d15343f0d56d25ff1a5 SHA-1: 5165e3e6d7f95d9f28bb148645fd2d91d9fb9fac SHA-256: 8ef8fa628826e81fdb6a67bd2407d8c13972422822091788bcee73f062c8bfb7
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to external websites, many of which are likely part of a link farm designed to deceive search engines and users. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'multivariate data analysis book pdf', likely to trick users into visiting the linked malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dugedepap.ru/award?keyword=multivariate+data+analysis+book+pdf PDF link annotation
    • http://calipshatngaccs1.xyz/21922343781h0ytl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_600840d1aaa6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491946/normal_5fcd564e34111.pdfIn PDF document text
    • http://tonerinkstore.com/62250188508p3auc.pdfIn PDF document text
    • http://bufo.online/navy_federal_rotc_career_starter_loan0vt6b.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/14744864954oume.pdfIn PDF document text
    • http://feedbacrnz.space/95563759451a4fyo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5fdea21a80359.pdfIn PDF document text
    • http://gutufozif.iblogger.org/hydraulic_accumulator_types.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/wuxijibux53b9b.pdfIn PDF document text
    • http://agent-ritual495.online/1186702414iwjyd.pdfIn PDF document text
    • http://smartcreditus.info/christian_meditation_experiencing_the_presence_of_god_by_james_finleysrv37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_603b0382f2a28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371790/normal_6002d2d862c80.pdfIn PDF document text
    • http://dkshlyap.ru/best_soccer_manager_games_androidcwmxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_9b2c404fa31147088bc9f710093730c2.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0692a2e4ba3d405dbf39758ea986b0fb.pdf?index=trueIn PDF document text
    • http://wisakixatepifu.epizy.com/vizubapudonugurakuwolino.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_35067b59e31e49d0ab93f7a70c688279.pdf?index=trueIn PDF document text
    • http://beruleruz.rf.gd/viwisurodiduloteg.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_2cc31a6682334d08b6e0109608358440.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_e3a80b99cf5b4994a5aed67572174ab1.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_97eb814639af43a9b4c7cdc2c2464c71.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_af740a42a442465bae34a5f4c34df72c.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_05087610d67b4e74b5748fddc3b4c2cf.pdf?index=trueIn PDF document text
    • http://ralevibeset.epizy.com/advanced_actionscript_3._0_animation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 5404 bytes
SHA-256: eb88eb4ec70499011adbd5f9419ac2b1bf72094da10d517a6b7a84d2f0c61c05
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 17824 bytes
SHA-256: 586a5e60fe11f95d3661a54d47ed02a21e31b4fb800da814d8b977763b8faa71
font_02_sfnt_off000156d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D1 10552 bytes
SHA-256: 4ad65e59175d1d0050ba86b2b6ce9124785594b71f5c21f5e186148704d69192

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