Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27af6a65141e24…

MALICIOUS

PDF

72.5 KB Created: 2021-03-15 21:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3baa3bb20d80f32f8cf7ad534be7ad65 SHA-1: d0b72581a08eed14968b441d50b68d1de59530f8 SHA-256: da27af6a65141e248f7951790c9029486df6d2142fffe5c543d3b99309caf62a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

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://vilenefex.ru/wix?keyword=statement+or+question+worksheet+ks1
    • https://cdn-cms.f-static.net/uploads/4412780/normal_6030d666226e4.pdf
    • http://dusosax.66ghz.com/pijisujewapi.pdf
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fee347816404.pdf
    • https://cdn-cms.f-static.net/uploads/4487888/normal_6035626e02dc4.pdf
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/lubexajasisadaxen.pdf
    • https://wexopusipomela.weebly.com/uploads/1/3/5/3/135313487/xesudodawe.pdf
    • http://rulerezimatot.22web.org/videvijifuwizeb.pdf
    • https://cdn-cms.f-static.net/uploads/4367923/normal_60341a775a7b9.pdf
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fd133d94fe46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55e50e7d-a49c-4bcf-9595-d34586deeeae/wopuwiz.pdf
    • https://uploads.strikinglycdn.com/files/bfd9abd7-6fb8-4004-b1a6-c827e537f1d6/38570530305.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_4b84c526b06f4969810d2ee258d6b3a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a87471e-d759-4b2a-84c0-e97f352bc71f/tumafevex.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_13fddd40a5a74ea6ac4a5c47fee384eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cbe7500f-a8fc-4980-9a8b-672d92d9b5c6/74230177736.pdf
    • http://mokupemoraworal.epizy.com/12755204573.pdf
    • http://rasunafosav.epizy.com/fozolizezigifojowuwe.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_f5c4e77eddc44376b56aa463e2f64fda.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a58827e5-6a6b-4226-bb41-c1299eb46f78/it_essentials_exam_answers_2019.pdf
    • http://lasikip.rf.gd/durazonizine.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_off0000ddb7.bin
87815c9c8be447dc24b35f152b9e534584b3b4db77add02d750aa94dd32fbc11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5328 bytes
font_01_sfnt_off0000efc5.bin
e3c9c45faaa50b3cbfc51fc6990b73e291ea3fc3936df90fc5969b944463112b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10756 bytes

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