Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8d87f22eb7e5fb…

MALICIOUS

PDF

73.1 KB Created: 2021-05-28 14:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7811e5efb0b5629cd3736bdc78cb0cb2 SHA-1: 0466964d7c848b3fef1aee322349e98826df3693 SHA-256: 9d8d87f22eb7e5fb08d204669191c45d6be6cac25f3f1e93c3c8979fd007059d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful 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://dafemum.ru/123?utm_term=wpf+template+binding+two+way
    • https://cdn-cms.f-static.net/uploads/4380078/normal_604d3720b580c.pdf
    • https://cdn-cms.f-static.net/uploads/4459036/normal_602821320774b.pdf
    • https://cdn-cms.f-static.net/uploads/4366043/normal_60145855deb17.pdf
    • https://cdn-cms.f-static.net/uploads/4490529/normal_60254b856a15f.pdf
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5ffa89c12758b.pdf
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/6569164.pdf
    • https://pusakirur.weebly.com/uploads/1/3/4/5/134523180/5037661.pdf
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fc676894dd02.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_601fabc1bedfe.pdf
    • https://cdn-cms.f-static.net/uploads/4374715/normal_6054bcda0cbd7.pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_601a112f0597b.pdf
    • https://cdn-cms.f-static.net/uploads/4463275/normal_6059536f16935.pdf
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6022bca8b1d21.pdf
    • https://cdn-cms.f-static.net/uploads/4479905/normal_60691b82bc288.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_6018622e7f83e.pdf
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5ffa45124d587.pdf
    • https://cdn-cms.f-static.net/uploads/4369932/normal_606a770f31f36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9612221b-424c-45b3-ae2e-3bca2fa58c22/30305317535.pdf
    • https://uploads.strikinglycdn.com/files/6cf3d8bd-078c-4a91-a7ab-43f4378db850/basic_biochemistry_books_free_download.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_off0000dfda.bin
6e9288d41138bbe285551a2996497f550e825524d39dca224d8ece7f6872b13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 5436 bytes
font_01_sfnt_off0000f264.bin
9ba5255b769218d4a999fea5f9d31fccc8444f30f36a14fb0326ad410c56dfbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 10824 bytes

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