Malicious PDF — malware analysis report

Static analysis result for SHA-256 3834004a966c5f5c…

MALICIOUS

PDF

60.9 KB Created: 2020-12-18 10:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0720868caac8f7f81277c21162dd1a18 SHA-1: 83960b77d198e039706e94f7dc7475a70d49967b SHA-256: 3834004a966c5f5c7f4ff978b68ff99de62c0d1f6dc6003644de9b8eabdf4bb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/strik?utm_term=mine+caves+cool+math+games
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/6713010.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fad983357925.pdf
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5fa7f3f6697e7.pdf
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5f946fac3cf4b.pdf
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5f99283192fc8.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f87c694c0c1e.pdf
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9c7e7147199.pdf
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/mumar_noxane.pdf
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fdc28bd55306.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nupotukig/dosumunul.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_off0000b427.bin
b845ea0ad3cb617005289a8875b3775568b8a060abdbf75ccb379304f5313d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 5184 bytes
font_01_sfnt_off0000c5b8.bin
c884e76f2be4c3e25d8caaa96bf6a38e7ead52ce934dd99be0e5309e034188fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 9832 bytes

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