Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02858aca0742035…

MALICIOUS

PDF

67.2 KB Created: 2020-11-13 01:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c423591107301e2a20554d27b2dd4f SHA-1: df95b7523d9d6017d38f4a1c767402efd1305e74 SHA-256: b02858aca074203575db90d918ad989a1beaca905de239e8674afab681d8e5ad
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=q88+forma+de+barco
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fa1757dc7d51.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/6686859.pdf
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/a3c1ccca0299022.pdf
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/3228699.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/32eee4b9.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/724140.pdf
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5fad9d75db5dd.pdf
    • https://cdn-cms.f-static.net/uploads/4404976/normal_5f96246bc3a17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a33b913-61f2-48e7-925f-f894d2f318a6/warhammer_age_of_sigmar_books.pdf
    • https://uploads.strikinglycdn.com/files/fea0c465-cbfc-4939-9aad-96f8cbfb8024/san_diego_clippers_hat.pdf
    • https://uploads.strikinglycdn.com/files/6dd61930-e262-4262-88a2-b93bcb37643c/minecraft_dungeons_crossplay_ps4.pdf
    • https://s3.amazonaws.com/wilugugo/metso_jaw_crusher.pdf
    • https://uploads.strikinglycdn.com/files/9938727a-9dcc-4446-92ef-23aa6c6d6434/rizuvifuwumixepiridodi.pdf
    • https://s3.amazonaws.com/laradusa/kynan_bridges_kingdom_authority.pdf
    • 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_off0000c823.bin
cb7d8a2336b289ffcfe815ec205983103849b305e32991cba8477eac27c13946
pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 5352 bytes
font_01_sfnt_off0000da43.bin
0c6f426b4b439ef18413b60a82145c141b38f99bde4d9085c170ce4c28d77f41
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 11528 bytes