Malicious PDF — malware analysis report

Static analysis result for SHA-256 a325091ed400a438…

MALICIOUS

PDF

75.8 KB Created: 2021-04-07 22:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a7e0e784260e6a3022730d6c668bb70 SHA-1: cbc39558890455b18f18849eb1be9a55decc1ae4 SHA-256: a325091ed400a43859ca38c0ab0524edb7830b5981f95f266700f044e72e7153
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous external URLs suggest the document is designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=el+camino+del+artista+opinion
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5ffcf31cbe632.pdf
    • http://shmelev.pro/6679588694680ovu.pdf
    • http://kupiokno.su/567161416996v3at.pdf
    • http://distornyup.site/altistart_48_fault_codes_usfh1rr2.pdf
    • http://mowogaw.mypressonline.com/19080375392.pdf
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5fed5b1943bc9.pdf
    • http://rezonansmusic.com/43536604957rh0co.pdf
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fcd3108620df.pdf
    • https://cdn-cms.f-static.net/uploads/4456705/normal_60197ad68bb1b.pdf
    • http://bigtittybella.com/dokojaxotadamazosuxesvy1g9.pdf
    • http://jsexj.fun/45007773612l99bp.pdf
    • http://yarrebitteh.online/kavusitopumbz0xw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe5ab2b1-4d4e-4005-8868-809c7443051e/jusidarinokuvanixo.pdf
    • https://uploads.strikinglycdn.com/files/9133d6a2-ab65-42dd-ae73-b13673b3aedf/gazelle_edge_glider.pdf
    • http://jabejanaboz.atwebpages.com/movup.pdf
    • https://uploads.strikinglycdn.com/files/e30a2f10-2468-4b8a-8869-30cca4a3480c/parmesan_bow_tie_pasta_nutrition.pdf
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_9b3ef52b8c1d4f03841e53e271b0e70e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd53206d-0b08-4251-bdbb-36f9f314a34d/vepilibagomavax.pdf
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_d262138cb9aa4ae281caca6d224876b5.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_3ff463e89eb342988a47ed0214116964.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e864.bin
f30809474f666a0413121fc6cae9320ee90cea3783eb81551bcdf28b12acc861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5176 bytes
font_01_sfnt_off0000f9e9.bin
e0ddf85ac0a43840f302f8861816e4f7569cf7bfddc1c130335e6c6373b3dc09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 11672 bytes

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