Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f595dbbe307889c…

MALICIOUS

PDF

58.6 KB Created: 2020-12-18 20:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9a0487a4c80deb6229a276e6b5b23d2a SHA-1: 239b675a54ddb43df1a8f9c6d3610b80d8e16eb8 SHA-256: 1f595dbbe307889c8bb1929c3f93b63560106a987ca7840f92e75bd59b40bfe9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cctraff.ru/123?utm_term=tea+earl+gray+hot+meme In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5faf5b2c94da3.pdfIn PDF document text
    • https://rekaxuvukevo.weebly.com/uploads/1/3/4/9/134904446/zopitewovilela_nigokazu.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/1266094.pdfIn PDF document text
    • https://fodorofofojep.weebly.com/uploads/1/3/4/7/134769626/4579433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce5f182c00fb194151f4ae/t/5fd6c7b813a48350e822132c/1607911355288/bgp_routing_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/narinas_abertura_piriforme.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/fowakizozov.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/14869884014.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/dogukomogum.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_off0000a8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E3 4972 bytes
SHA-256: 6529ee0cad441824f3f94b5d4ee13ba9ba13a78614988baa7ded77db3c29787f
font_01_sfnt_off0000b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 11104 bytes
SHA-256: 323b1baefe898ac194ce50c95ad5d8b7c38b094ca747520c690a0dad41487004

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