Malicious PDF — malware analysis report

Static analysis result for SHA-256 b499c5503426f3ba…

MALICIOUS

PDF

82.7 KB Created: 2021-01-05 05:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 949914a58945661a76bae186497381a5 SHA-1: 76c125a3d17ce1555b94e034898c9923ae1d5f0c SHA-256: b499c5503426f3bade6e0ed1283c405c1367b6f558d73fbe396c39f4be43ba00
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=ielts+general+listening+samples+with+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5fb75dedaef2a.pdfIn PDF document text
    • https://cdn.sqhk.co/bojidokagivi/mjihhV5/50078178914.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/5617392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5fad2f2a8f57b.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/w9zhgjj/99150702702.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fa3755ede949.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/kivewi.pdfIn PDF document text
    • https://tunefanixeso.weebly.com/uploads/1/3/4/7/134733210/dawanakuzagegiru.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/mesotodimus/14956644899.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/bejazadipesame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8e04fd-58bb-46f9-8734-edd83fef10f5/jilubinopa.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/86896888719.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/seaplane_for_sale_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/zajilusedepilezo.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_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 5484 bytes
SHA-256: 10f246c1c31c518eeb71bc0b33cebf33b78429a37e5d0d5553eefe3fb8529094
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 10668 bytes
SHA-256: 067efda1b031119ef9303245294d4c7dabbb279ba4ee2ad6ca8da57178684c8d

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