Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc382b7403e168…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 11:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9eee01d7f102fb11875102ba551b8ddb SHA-1: dd8ce975edc1bb1d70b8dbcba9951db2a00c0af9 SHA-256: 57fc382b7403e1680af433a85a927e2d9dc3c1f95b0c3d7437794958166bee6a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within a large number of seemingly legitimate ones. The primary malicious URL identified is vilenefex.ru, likely used to host a phishing or malware distribution page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=berlitz+english+level+4+pdf PDF link annotation
    • http://2020coupons.info/458121327271wl03.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/63506249526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6044754395383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_6023645f4c761.pdfIn PDF document text
    • http://reawolt.online/sefijoror6pqh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_6047755e49f45.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/anionic_surfactants_organic_chemistry.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/pumogetunelaki.pdfIn PDF document text
    • http://serdyukov.pro/46443013456lpgk4.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/87255821421.pdfIn PDF document text
    • http://qupieasy.online/cuanto_equivale_milimetros_a_centimetrosgbiov.pdfIn PDF document text
    • http://vovpomnim.ru/careers_in_psychology_worksheet_answers35iyy.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/appositive_phrase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_6002fd1149b4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bac0bee-5a33-4055-b514-12e26232c6da/60363581471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b00aec-a1d4-4e5a-9882-ebf69864a2bb/grammar_active_and_passive_voice_practice_worksheet.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_d67fb691d1bd4b549a718550ce61cd82.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_c1a4543815b34e4da316e6b0e0f18cf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de0ee25-fe08-459d-9377-ee904cad9828/batman_killing_joke_comic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f2aff9-ecd5-4654-a799-e7eb3a467cbd/6550569293.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_6b366e86049f433aacd34bbf95d840cf.pdf?index=trueIn 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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 5340 bytes
SHA-256: 8259a812dbc43013e191bd1c6a61cb755640d9efe0527709a07565d3c3581300
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 12436 bytes
SHA-256: 4233a8b04803594d13a634ed9ef8c794e0165bfb43e193fd7c6551897ca27aa6

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