Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7470a8668d95ab4…

MALICIOUS

PDF

82.5 KB Created: 2020-12-15 22:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf7078f0ebf347f0776ebc5cbd04f3c SHA-1: 14a15ae6d8de991d259fc7168e78ceecc3990191 SHA-256: b7470a8668d95ab4ab6f66b5b172968f88b74a00a66672cf2f4dd71ddc7f16c4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The document body, though heavily obfuscated, contains a question related to stockholder interests, likely a lure to encourage interaction with the embedded links.

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://trafffi.ru/strik?utm_term=which+of+the+following+considerations+are+stockholders+most+interested+in+evaluating
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f924c7a12fa5.pdf
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdf
    • https://jagavovukivotu.weebly.com/uploads/1/3/4/8/134881855/6519335.pdf
    • https://vudivopaf.weebly.com/uploads/1/3/4/8/134876542/de6d729.pdf
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/82696e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vedexajawo/web_hosting_free_html_templates.pdf
    • https://static1.squarespace.com/static/5fc65c3a24b06a7eb324d99c/t/5fd003c7e39aae34910f0196/1607467975960/70_s_music_hits_free_download.pdf
    • https://static1.squarespace.com/static/5fc2953ad26ff1194f7e808d/t/5fc4b2367acac6192a559799/1606726203746/wibamiduregasasugulopo.pdf
    • https://s3.amazonaws.com/zirojopemup/43741657005.pdf
    • https://s3.amazonaws.com/tekujel/hemp_necklace_patterns.pdf
    • https://static1.squarespace.com/static/5fc5932f0b6b03258f55155a/t/5fce5e0ad336b863f0f4a877/1607360010757/97614697658.pdf
    • https://static1.squarespace.com/static/5fc69c572cf09257bd930dfc/t/5fc77cd948d5672cfb40d352/1606909147774/mizefoxopoguwaji.pdf
    • https://static1.squarespace.com/static/5fc5174de5c7695ca9b695f8/t/5fca54c995be03588ccefa80/1607095499738/pathogenicity_and_virulence_among_microorganisms.pdf
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc2c8304e98326c026c9e2d/1606600752582/modeling_with_nlp_robert_dilts.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_off000103e8.bin
11c48fc5ccaf3365dc7aaa87214d290d3d1db4612c717b1419d8b6fefcfc1cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 5664 bytes
font_01_sfnt_off0001172a.bin
828ade45c08b1273ae47b5f971e849172228e4fc01ddecc45552f92f50c66f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 10768 bytes

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