Malicious PDF — malware analysis report

Static analysis result for SHA-256 05091c3f19ae5667…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 06:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1d02785bb3d9a772d16fbed02662c6c SHA-1: 1d79a7255be14bd12ae155594aae102d492faaa4 SHA-256: 05091c3f19ae566719092c22903fb438de30cbaa3d354d2493019d6195acadb9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute or phish via these links.

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://seumenha.ru/wb?keyword=commedia%20dell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367313/normal_600c639a3ad22.pdfIn PDF document text
    • http://discount50.pro/aquatic_ecosystem_sort1rxe5.pdfIn PDF document text
    • http://alexsaf.ru/weriwfknu2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_6012db94355cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fc728c71d3af.pdfIn PDF document text
    • http://zeputixov.22web.org/jikalinojaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_601d9a1b32cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_6029d944d55bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5fc69373706cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fe924722df53.pdfIn PDF document text
    • http://obschee.xyz/46857378825by03b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakewexapenox.epizy.com/primera_bravo_ii_software.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/ben_ten_alien_force_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/libro_materialismo_historico.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/whatsapp_for_pc_windows_10_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/31552621579.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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 5240 bytes
SHA-256: 589ad5ac36745f9bb4ada94dd241b1d9afde11aec94ec293c00c4af425bce0c8
font_01_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 10224 bytes
SHA-256: 50a765c481c42e650e427a90ef97d82d46493058874abea47a8a8b732590f230

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