Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc71ebe6d715e29…

MALICIOUS

PDF

90.4 KB Created: 2021-03-21 08:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aeb50cb15e6299e084c3b6034bd534ba SHA-1: 89618c55411bbc846c3cbce9db8b6b1f6df3d1f0 SHA-256: 0bc71ebe6d715e29463b1ad317e311dc7f971359aafd88ec0aca92d27e77f93e
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a worksheet lure, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=comparative+adjective+worksheet+esl PDF link annotation
    • https://sisikirores.weebly.com/uploads/1/3/4/5/134529142/paxiputuvom-gifumeviman-zawufonusarog.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_charging_error_1_on_roomba.pdfIn PDF document text
    • http://lofomerevudawem.iblogger.org/lepelulagulasuror.pdfIn PDF document text
    • http://nadugavuwitaleb.iblogger.org/best_international_law_school_programs.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/aa6b8c2381.pdfIn PDF document text
    • http://mixedevik.22web.org/wefosafizituduvam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vijanemafe.rf.gd/tatalaksana_pingsan.pdfIn PDF document text
    • http://vusanaxipunuli.rf.gd/kamev.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/what_is_unilateral_offer_in_contract_law.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_9c981ec25cef4471bef3aa4a8b607478.pdf?index=trueIn PDF document text
    • http://ledafavegarawam.rf.gd/48202103083.pdfIn PDF document text
    • http://dasiletu.epizy.com/how_do_you_put_conair_clippers_back_together.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_c4a1ba494b064060b6ab194058f78554.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_b890b38c2c9f474db4718b0ab634b17b.pdf?index=trueIn PDF document text
    • http://pawepeg.atwebpages.com/which_avengers_comics_are_worth_money.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_0d5604afe99f47cfa47cf168e9129114.pdf?index=trueIn PDF document text
    • http://mutifitiwexo.epizy.com/pdf_splitter_and_merger_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 5512 bytes
SHA-256: 99e6dbd7eea555ff397b9759bd6d52820a88b9fcdb6b918d4c94ab59b3da4aad
font_01_sfnt_off000136eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EB 11072 bytes
SHA-256: fa0b7a7b671264c457d1e2a173abaa2991a6d0fc067287caf92ab22e0e83c7fb

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