Malicious PDF — malware analysis report

Static analysis result for SHA-256 96268a2d64f028b1…

MALICIOUS

PDF

93.8 KB Created: 2021-04-18 08:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e8ad031dc345e651e62c48b3e595c3 SHA-1: e06461dae9e4bab840b5ea31c2fbf4f63ca42d38 SHA-256: 96268a2d64f028b1fe7321633e2f608cd56bf7f77f61208e5387538892aa232a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF documents. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=pedro+paramo+english+audiobook', appears to be a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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-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://kuzutuzo.ru/strik?utm_term=pedro+paramo+english+audiobook
    • https://cdn-cms.f-static.net/uploads/4445742/normal_602b78e1270dc.pdf
    • https://cdn-cms.f-static.net/uploads/4406466/normal_6017a65456721.pdf
    • https://cdn-cms.f-static.net/uploads/4485927/normal_605481bbbbfa1.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/f289224e2d6fd.pdf
    • https://cdn-cms.f-static.net/uploads/4423166/normal_60328b7012695.pdf
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fd1cfb13f5e3.pdf
    • https://xovazarorofo.weebly.com/uploads/1/3/4/4/134457653/2883534.pdf
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc6b85b656d0.pdf
    • https://cdn-cms.f-static.net/uploads/4379355/normal_604d4821b3be7.pdf
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ff5b31c4401a.pdf
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/b9e34a6d.pdf
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/sudamegatogaw.pdf
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5ff4a4986de6c.pdf
    • https://cdn-cms.f-static.net/uploads/4474176/normal_606a290f25151.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_602563f2cff7b.pdf
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/1895549.pdf
    • https://cdn-cms.f-static.net/uploads/4368493/normal_605c48655f23b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_b1a231e12fc84964b660228a041c72a8.pdf?index=true
    • https://s3.amazonaws.com/vavejijitatofu/mentor_mentee_relationship_guidelines.pdf
    • https://s3.amazonaws.com/buxoparadazegu/hydrazine_formation_mechanism.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_a774e4d5019344c5b6cf2336b66d13fd.pdf?index=true
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7ca9b7c512314932b7eb6d21b4aa33e7.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_off00012faa.bin
c4f1068bc3d6a553b125f8ed7bd69ab8bd616f98f17cca3a0dd589d822c1ee1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAA 5576 bytes
font_01_sfnt_off0001426e.bin
0a059640890addd22cab1c2d1897ae8c323bd5a2d61b123e1dd440c8780f8b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1426E 11456 bytes

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