Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a3dff314c2658d…

MALICIOUS

PDF

69.1 KB Created: 2021-04-01 09:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 887ffc4c0ae5e2d61d35505ec6222e2e SHA-1: a942b8334469a1489634384041f16805cc158e4a SHA-256: e1a3dff314c2658d6dc1d7f29754b28e48011228a2d32bee3ecb24ce989877d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a pattern of redirecting users to potentially harmful sites.

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://botokaw.ru/award?keyword=guitar+case+chord+book+pdf
    • http://ifeelgood.club/kalman_filter_matlab_codenzwy9.pdf
    • http://jifarobajis.sportsontheweb.net/21733614374.pdf
    • https://cdn-cms.f-static.net/uploads/4418369/normal_602c361d8700d.pdf
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fda2a048a88e.pdf
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fcf794e1c4bb.pdf
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/7883648.pdf
    • http://jolidulikan.scienceontheweb.net/pudilivowegirirazixu.pdf
    • http://fitness-ital.fun/5998244101481k4y.pdf
    • http://domen3.club/xukatupejeg64nyw.pdf
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/5185350.pdf
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/b570f2344.pdf
    • https://toxedozopofezi.weebly.com/uploads/1/3/1/4/131453782/5902265.pdf
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/namezijin.pdf
    • http://fikosarodone.medianewsonline.com/15389556701.pdf
    • http://qiwi-wallet.online/buvuzinudukokh8q5r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_c1b530e63ff94d949ad0c29c20a051e5.pdf?index=true
    • https://s3.amazonaws.com/sajatesawodiji/circumcenter_worksheet_doc.pdf
    • https://s3.amazonaws.com/vufuzewasi/fodegi.pdf
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_76f2844759cf4241a29cd9ea40e50bdf.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_8f0aa53f39994de2bc8f9623e9ce39ec.pdf?index=true
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_d3ff45238947465980b1c94d593a9ed1.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_off0000cf5c.bin
1bfa8904089de6089b49404c337e623a44387bce20c59edbf20f8562acc16979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 5448 bytes
font_01_sfnt_off0000e1da.bin
a03a41500ba448005fd0eba225f5dddc6d3271958cc514074a03e8028053a1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 10424 bytes

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