Malicious PDF — malware analysis report

Static analysis result for SHA-256 72502883e237c049…

MALICIOUS

PDF

67.6 KB Created: 2020-11-17 19:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: dc320293bbeb58b2e768b99c600db246 SHA-1: 84ae2451520e29dafd965ca9d73ba8266e0f6a8c SHA-256: 72502883e237c049cd4ed73edb4891b17aa6f4f1a9262d8b9ac6dfc70ec44732
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=ielts+writing+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f980b0e95ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f8f1ca2206f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f878abeaecec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8bf6172fbd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f8ea796e9a63.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/d6bf5bfa94ac6.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/jidosatikim/32084508061.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/64170417161.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/accounting_general_journal_entries_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/65050532721.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/26536038396.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/744655048.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/harley_quinn_costumes_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/tewapazuseka.pdfIn PDF document text
    • https://drive.google.com/open?id=1hJb5bOZelCGHdFcJ8iUkYZSIn 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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 5168 bytes
SHA-256: de04578441212cc930a595063894f02fe12f3b966f433026f59fe4ac8a0a0ff4
font_01_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 10764 bytes
SHA-256: aff0be19730d64ef38ae682d331d90c467362b8e8b9bf63030d2c343851f3c21

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