Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74a924d453e04cb…

MALICIOUS

PDF

67.3 KB Created: 2020-11-22 04:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7dd8cc77f049bea884196e2ccbe251c4 SHA-1: a5bfc9301b446e3ab998be2365084a6dd9c07269 SHA-256: c74a924d453e04cb5744c9d11c7556e10c044308cd9428de6d90a33d553bffb2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs, including one flagged as potentially malicious, points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/123?utm_term=cousin+eddie+dickie+outfit PDF link annotation
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/8740404.pdfIn PDF document text
    • https://mogugadikawes.weebly.com/uploads/1/3/4/0/134096191/xuvutefiruxis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f908a79c70b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f98ba975e7ff.pdfIn PDF document text
    • https://dudererojafa.weebly.com/uploads/1/3/4/3/134362298/f9b6f958f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f87199997704.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/wizedumi/air_conditioning_and_refrigeration_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/sri_rudram_chamakam.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/casper_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/etcher_raspberry_pi.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_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 4648 bytes
SHA-256: 333d3ff2acc093d8812022d418fc3e852031f35b19f1a4661872679c28f21d12
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 11028 bytes
SHA-256: 5afe81743f5c34866247beb7080ef50b8b5621b91b4914b08784d28ac4db0962

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