Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cc37462223f829…

MALICIOUS

PDF

81.1 KB Created: 2021-03-04 13:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9d98157cdc8f8e518ffaf95e2a736ea SHA-1: a48a6e651501121e73606cc05b412ea0f3df5632 SHA-256: 19cc37462223f829b75fc7a1952e318b891d149d4b7205702756e6af31bc4e72
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, with at least one pointing to a domain ('vilenefex.ru') associated with malicious activity. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of external links and the overall detection profile suggest a phishing or malware distribution attempt.

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://vilenefex.ru/award?keyword=how+to+write+a+science+fiction+story+pdf PDF link annotation
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_6016ff27dac65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5ffb6ffe61ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6030152cbf552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409616/normal_5fdd7e39a2f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_601e808909993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_603211214531c.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/vukegazagejaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5ff0761d99bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fda1296df80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_602c60bc8d532.pdfIn PDF document text
    • http://pifafuvutote.iblogger.org/logo_quiz_ultimate_answers_level_1_airlines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5fdac58d32bfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe420a13768a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_602b61d32e1ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejujebiwibi.epizy.com/goodnotes_bullet_journal_templates.pdfIn PDF document text
    • http://reluwiz.epizy.com/linksys_wrt_ac1200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e5ada2-b7ec-40fc-8767-a4952e42232a/metal_gear_solid_5_phantom_pain_quiet_mission.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/sewadelogusumejufutipip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29e19eb-0c5d-4224-be8d-750f57f042b0/master_forge_grills_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e181a20-de93-45a0-8a69-63a0b241b776/lagifex.pdfIn PDF document text
    • http://wogurep.epizy.com/lumuwa.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_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 5272 bytes
SHA-256: 2cb596e78ff05bbc92f2cb21c24fe89119b96b230872dce9aa38200a1f6bc3f2
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 10184 bytes
SHA-256: d8f9e3a707d563ab6ac98b552b60b6966f6078234747afc9b056800ebae13ca3

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