Malicious PDF — malware analysis report

Static analysis result for SHA-256 4754084e492ab192…

MALICIOUS

PDF

77.5 KB Created: 2021-03-03 16:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c302be18aba0a0ea61b2c96179a05cfb SHA-1: a264e7673170579110ad7a5b53d07a74ec6e9d71 SHA-256: 4754084e492ab19262cb78883b64ebbdf090ead1c07f06d6ae5cfa6945188b41
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to 'vilenefex.ru' which is associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=casio+scientific+calculator+fx-115es+plus+price PDF link annotation
    • http://krokoboko6.xyz/how_to_take_apart_western_digital_my_passport3a7y3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_603e850380ef6.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/4869568.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/lisiwexura_jaweverigawaben_nerekive_vaxebudoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_603effaf49433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd66ee95fe8a.pdfIn PDF document text
    • http://negozio50sconto.info/779877227726e9rl.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/9jfligW/aaa_hockey_teams_in_florida.pdfIn PDF document text
    • http://mnclassis.org/runurazaxozakufupu7r5d.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/ajgEhOR/horror_clown_pennywise_scary_escape_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5fe155a70126f.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/meravaruxukezowejizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visagiza.epizy.com/war_thunder_squadron_battles_2020.pdfIn PDF document text
    • http://sozidasagekixur.epizy.com/beauty_plus_pro_apk_onhax.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 5192 bytes
SHA-256: e94f6f945bf5830ca0216be3693c1901b5d82f6b274f8fd8dba70a8c11cfecdb
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 13116 bytes
SHA-256: 25c5bc66b361495778e9e1e7db465104b7c72f4a79d84fcd4bd938a34386a778

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