Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75f29850982eea1…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 18:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 94b13c788c6edf2ad59205af6d845434 SHA-1: 18f08161e159b500e4a4dc16f6521f2742092fba SHA-256: f75f29850982eea194a9e50cd62e5491add7d8c397695590efce89f13e1f3eba
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is likely used for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a compromised site, potentially for phishing or to download further malicious content.

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://kuzutuzo.ru/wix?keyword=bolt+of+cloth+unturned+id PDF link annotation
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/9f699901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_602d8da6093df.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/0cd3af61b5c149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_604f0982c6fe0.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/3427728.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/rapumowolip_rabukamojeketo_sulek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_604b880c89bfc.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/57285233461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476564/normal_5ff1c1d7951e6.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/84222479182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_600630fa47142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaporam/graduation_party_invitation_templates_free_printable.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_3156bf341cad41698c1d657b548ac986.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/66458975516.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_457c8f34f2dc40038df4ac068bce92a1.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_476b390a853c4de9b74decb8622dc2e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/50984040843.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_4991677413404caba5d455d54338ca40.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_6f4e508fde3645a8b1a6437dd9fe5430.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_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 4772 bytes
SHA-256: da3afb8f728ff23b77fc3c7e2efddf1388c8351f8a83f2a53a866ef16c781102
font_01_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 11156 bytes
SHA-256: fae076dbb34adfbf06854ff260267f402577db492742d1a100ce8363aa5e6f5c

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