Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555ac6ec5f61af3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-01 05:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: a4df3353a1d613dd4c13de1e2c4034f1 SHA-1: 321e6b47223b7c171046390ec294c638f4bd8d81 SHA-256: c555ac6ec5f61af3a90e6e6345340ce497a8bb229d94b70a5691313004d3409d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'vilenefex.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wb?keyword=did%20the%20actors%20in%20fifty%20shades%20of%20grey%20get%20along PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6022aec36f061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6014056d198a3.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/5016226.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/5324756.pdfIn PDF document text
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/matugikevoki.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/5656575826.pdfIn PDF document text
    • https://rexirarilabe.weebly.com/uploads/1/3/2/6/132681411/parewezo_kanadusigekeman_gawatuvijo_wogukexu.pdfIn PDF document text
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/resarujopuneve_tibaduruzovir.pdfIn PDF document text
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/4362180.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/84636871368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_602710a1a3781.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/xomefafavadadukemebepana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_6022c95483ec7.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/what_is_the_difference_between_oral_b_500_and_1000.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/nenuj.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/nudufo_kokazomenemes_guzel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/new_york_philharmonic_principal_horn_audition.pdfIn PDF document text
    • http://xaxevuvu.epizy.com/21411793791.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/i_am_the_purple_guy_lyrics_youtube.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/best_recipes_from_chrissy_teigen_cravings_2.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/gavebogutusog.pdfIn PDF document text
    • http://womawujun.atwebpages.com/xutokowevogixizoxorubu.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/32891458930.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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 5384 bytes
SHA-256: 525ec45e840f85a7d1cd2763b3d58d1673d76fa7d463aaf7fca9e4c2bf76c38a
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 10400 bytes
SHA-256: 26af2ca9417caac9454d3660d571d7f0751ef772fb2194e75119c3cf6f00b79f

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