Malicious PDF — malware analysis report

Static analysis result for SHA-256 d295b4d51e161b32…

MALICIOUS

PDF

171.4 KB Created: 2021-03-18 21:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88baaa1fb1470b16263e5181a2d9ffec SHA-1: e55786a76106863c7475cdd939d7ceffc1abc3dc SHA-256: d295b4d51e161b32c62140a9267f52f06bdc9c4df8b8f1b6684f3e4b19d97b86
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to `https://pelibifir.ru/strik?utm_term=star+trek+voyager+characters+tv+tropes`, suggesting a phishing or malware distribution lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this by identifying the PDF as a link farm on disposable hosting, designed to obscure the true destination.

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://pelibifir.ru/strik?utm_term=star+trek+voyager+characters+tv+tropes PDF link annotation
    • http://retapadu.medianewsonline.com/how_can_i_reorder_pages_in_a_file.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/rabejebesowijojade.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/0Lhd3jf/soviwuno.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fOPj5CO/modoti.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/gjgg1ic/65197616084.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/pijirogi.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/hieMghB/74056361896.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/pazovugal/nitilowelumokulimaxefat.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/94716775993.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_54fa3494868348b98208a5e0faed14fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/77636762556.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_a0a4def2dd4b4e5d8581d408cd16110c.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_4f26ec8cdfbd468b8085b578bebdf73a.pdf?index=trueIn PDF document text
    • http://buzumigasox.myartsonline.com/54220295718.pdfIn PDF document text
    • http://fixorafusadaxuk.rf.gd/annex_12_icao.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_6b6f3960c2ca4b3fbe828d8352e60115.pdf?index=trueIn PDF document text
    • http://telagivepovadul.epizy.com/fargo_hdp5000_cleaning_kit_instructions.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/11110899244.pdfIn PDF document text
    • http://kugilib.rf.gd/celebrating_success_worksheet.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/when_berserk_will_end.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_off0002652e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2652E 5492 bytes
SHA-256: be1ee81580a49ca005c09d1133f0da59a93900eff14d7fb031168fbcef12df16
font_01_sfnt_off000277e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277E7 11592 bytes
SHA-256: 0536fc8d3f629a7c125ee3b367c512d65705174c6c6ca673940c4bf348c05467

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