Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29bb46d27fdb224…

MALICIOUS

PDF

90.9 KB Created: 2021-04-01 08:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0313548a40f5bb6560499a5ad20a4c11 SHA-1: e662947f0930a503be2f095c4284193a406d73bf SHA-256: c29bb46d27fdb224d2fe97431319392474b24ec835f993325c5a0aa1e2a6d8e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=allan+quatermain+libro+pdf
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fd08fec9e7d8.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd672b60238c.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6057dada71644.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60134773cebb1.pdf
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc63ea1d3362.pdf
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5ff9c1598d93e.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd79bc4040bb.pdf
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5ff23ffa21a2d.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_601404ab0ddc8.pdf
    • https://cdn-cms.f-static.net/uploads/4366375/normal_604f6040b3e33.pdf
    • https://cdn-cms.f-static.net/uploads/4455659/normal_60438ddb2265e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_88a95aa1409b468c89b1d35d9e497afc.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_020fe90ffeb84859830e4b36c88a45ed.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_2b7cb97673ca49ad89379fafb1f8bdd5.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3cf1013c9e374149a8a4e50a5f973733.pdf?index=true
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_02d578b37cc249cc96ab630ecc208fd1.pdf?index=true
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_c7dfcd5ca2e346a68d9ad142205c77e0.pdf?index=true
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_5d47cbee51b04123a9dd543f2fd6c521.pdf?index=true
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_9e83c2acb81241ef9354398462587bce.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_24343fecb3b64c059c69a3965d1dae1a.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_584f0a43346a4db5af230bae5dd4b2e2.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_off000122c5.bin
ce626b029a674d6ae1b62e8101468f4cef2653d8065e6b26be935b3bb8bc26c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 5264 bytes
font_01_sfnt_off0001348e.bin
4b32418e842c5db94bddc3f779fac6ff202292fddf89664c0a127b684166918e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 12288 bytes

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