Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e8789d92e11dd8…

MALICIOUS

PDF

75.6 KB Created: 2021-05-18 02:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d846227da849fd70f1da209306cabe7e SHA-1: c22358bf8057656ac7a6d55747614696daf0c96a SHA-256: a2e8789d92e11dd8433902da442633e0de404db018f778062a6625cbd5aa3d38
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, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded content, though heavily obfuscated, appears to be related to 'Cambridge fce practice tests pdf', a common lure for educational scams. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=cambridge+fce+practice+tests+pdf
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fee87922c670.pdf
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/lubeta_vezufogomik.pdf
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/xawef.pdf
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5fcf5c83baef5.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_606828ac6784f.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60531b3b5f4a0.pdf
    • https://cdn-cms.f-static.net/uploads/4421623/normal_5fd7c440b8efc.pdf
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5ffbc0e7b93ac.pdf
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/noriwawimasapil-wukejokeva-xolatujanaxeg.pdf
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/5089301.pdf
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5fe64d2edf897.pdf
    • https://static.s123-cdn-static.com/uploads/4383916/normal_60002e42b4bc2.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/muxevexejewijopide.pdf
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5ff26e7f4d0b0.pdf
    • https://cdn-cms.f-static.net/uploads/4501794/normal_6056142d2d4a4.pdf
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/5710916.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_60418ed4a826f.pdf
    • https://daseguvemorog.weebly.com/uploads/1/3/4/3/134357845/zowoganofuva_zibesoduwewujif_bukivabemegop.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_601be1e44a8a3.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_601308c100cab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e98f.bin
feb2b5244fd32a89d52828ee26c2fa8d04a239edfb8f294fb722e3546ed6a3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5488 bytes
font_01_sfnt_off0000fc1c.bin
5b2200cb083a6ca8e159a3c6a9919ae30139b7eb7f1f2ff7e7744c0441597cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10432 bytes

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