Malicious PDF — malware analysis report

Static analysis result for SHA-256 031385b9826954ce…

MALICIOUS

PDF

81.5 KB Created: 2021-02-18 02:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e603e3582b5080beb11cd7a7e170581f SHA-1: 732063bfe4fbad6477c2d325bdd8001518575cca SHA-256: 031385b9826954cefd595c9b55c552a8ae4132a0b4fb4d366d739dbfacb8b230
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=bushnell+neo+watch+review PDF link annotation
    • http://lidzadva.xyz/17502952025voa7m.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/4459009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_600a235662c45.pdfIn PDF document text
    • https://kizozadasope.weebly.com/uploads/1/3/1/1/131164448/tiwadi-wapizo-jopala.pdfIn PDF document text
    • https://tifozemeg.weebly.com/uploads/1/3/5/3/135325228/jetipux-loduzepizex-gemutufuwiva-welolegupuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_601dcb2ac7215.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/2f3f0fbd1988.pdfIn PDF document text
    • http://musc-media.xyz/7660216126hhbox.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/kulalukizurujof-vevutupe.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/469ba9c65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fcf3bceb906d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_6006e114183ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc99c9d711c2.pdfIn PDF document text
    • https://winozijatefazo.weebly.com/uploads/1/3/5/3/135327399/90089c17b.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/f0c6bf4a99.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/zosevid/advertisement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/bitanubife.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/83073537196.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/suboj.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_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 5088 bytes
SHA-256: 21e107d8e9e9d58026f5f5aed12f19329244aafce40e2753c0188dd49e69bf8f
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 11516 bytes
SHA-256: 516fabd129a7f1c83930ba33181187ce49ed3ae8a937cfc4789795acca0d7976

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