Malicious PDF — malware analysis report

Static analysis result for SHA-256 637fc9cd89e9e70b…

MALICIOUS

PDF

66.0 KB Created: 2021-05-21 21:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee180a565a2b7891bbd9ace36d1ce45f SHA-1: 051e2b0503509d715c3666faf15ead1e307d3a9c SHA-256: 637fc9cd89e9e70b7ca2317c8e4adbe2693971f0d80993be4c2adaa304b15f63
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests an attempt to leverage link farms or distribute further malicious content, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=article+critique+sample+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_600deda51dc4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fcdcb6a50316.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/zofetovavoxapo.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/1256510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_605ba1c871f03.pdfIn PDF document text
    • https://noxitituruvid.weebly.com/uploads/1/3/4/9/134904787/3af69.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/8257047.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/pinibozedeluvem.pdfIn PDF document text
    • https://femesizexib.weebly.com/uploads/1/3/4/0/134018571/1906120.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/jenasiwobuga-birebokuroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_60199046d4321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_601b4219bd16a.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/b31f93a1bf11a0.pdfIn PDF document text
    • https://rusenudiwupelor.weebly.com/uploads/1/3/4/7/134704890/8445974.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/jigebari.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/vanupiduto_nuresulonabuja_zapoxapob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7f3b0c4432.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/xetokejujebodorel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/what_are_3_major_symbols_for_each_of_the_religions.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/kebomogobiloxizedepozi.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/agile_epic_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/vudikulob.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/pebozerejurugojerizebibow.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 5416 bytes
SHA-256: 744ff2ea16594d56d1f89a8293dccd5d55e63e6bb356a6fc83cc9a8543199c3b
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 10148 bytes
SHA-256: 9cf3d76dda89b4f76e357d02b7c3b08f5be35dac621f1c7af87a27258fd75eac

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