Malicious PDF — malware analysis report

Static analysis result for SHA-256 48575d1ba33250b4…

MALICIOUS

PDF

65.3 KB Created: 2020-11-16 20:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d492c70a34e7d47d29b9e86c9647a47f SHA-1: 1dacf93cdd65d504abc48a8a0f9c60fc40336f08 SHA-256: 48575d1ba33250b4acfce6f9f4d4598777ee90e5ec2f97c1c5c23bcca8f44508
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to what appear to be SEO-optimized PDF files, suggesting a link farm or phishing lure. One prominent URL, 'https://trafffe.ru/123?utm_term=outils+linguistiques+translate', is identified as an SEO redirector, likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://trafffe.ru/123?utm_term=outils+linguistiques+translate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444115/normal_5fa1b861e20ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fad24e749476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8d025896a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fad5b49ccd07.pdfIn PDF document text
    • https://rovalexi.weebly.com/uploads/1/3/4/5/134598456/sezirezelepomas.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/tarajix/old_rap_roblox_song_ids.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/libro_antologia_de_cuentos_latinoamericanos.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/mosby_ptcb.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/jekufirizuwij.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/types_of_critical_discourse_analysis.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_off0000c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07B 5008 bytes
SHA-256: d82692295b5188e60433d8e9884f9510411381830eb7909885a417bea73730b4
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 12356 bytes
SHA-256: d67316e4b60923bd80bf901161eb009ba3e2231e28a0f1a29d54436f5ebfc7d2

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