Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfd146f8bddc4d2…

MALICIOUS

PDF

83.2 KB Created: 2021-03-29 18:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe64aea18f678fcec1ec5582c97111be SHA-1: ae874ca1f8cf285858238a3af3e3776754c5544d SHA-256: 8dfd146f8bddc4d2384a33a37f6ccc520141ea268612f5613c3a426649ac1973
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to harmful content.

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://soxebez.ru/wix?keyword=torment+book+pdf
    • http://hookup157.site/50324082132non5q.pdf
    • http://vbnmcxz.xyz/tenovexaridaf5psqr.pdf
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6057c97a289ce.pdf
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6037ab1e293c9.pdf
    • https://static.s123-cdn-static.com/uploads/4450509/normal_5ff6263f68051.pdf
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6021f544e87fd.pdf
    • http://ita-bio.space/win_worley_binding_and_loosing_prayers1ucg3.pdf
    • http://fonivoguko.medianewsonline.com/dr_a_k_jain_physiology.pdf
    • https://static.s123-cdn-static.com/uploads/4426972/normal_60013ccf48390.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_6048a31b47e57.pdf
    • http://yblda.fun/53164115522ghs50.pdf
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fe68bb22d5b0.pdf
    • http://fabulouss.space/precalculus_limits_worksheeted0y2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_1b08c6cc979944098406899647b2aafa.pdf?index=true
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_7210e5d249f341e388b77baf51b63183.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_42f03359b6754ea48c94a9b26d6c8ed2.pdf?index=true
    • http://wegugoleta.onlinewebshop.net/jevamukekevodejusari.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_dce009323a964549b031716a32a8cf62.pdf?index=true
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_4d8ee5a39c2741c68c985a8012205f4f.pdf?index=true
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_59281f4c24c7491ba6883668a190a0ab.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_off0001095c.bin
ff6c8050199d32a3857e89db0e511aa37d120c2630c18428b45b1f25755e5a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 4920 bytes
font_01_sfnt_off00011a00.bin
cb25e0820ba4e420c3b397a021d9463e2bf4d6b2e5ee29731248e7e6fad8682f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 11024 bytes

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