Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39861ddffe7b8f…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 09:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2bb2e7c05053dba6f2737e58676b07d2 SHA-1: 1d28fb2e19a7d54a07a4fdf3364e05cb335be198 SHA-256: 7b39861ddffe7b8fa7d1114c0b59094f0aff85f4245eae74fe0c308664b8557b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a mass of external links, with a primary redirector URL pointing to 'https://trafffe.ru/aws?utm_term=toxicology+report+definition'. The document body, though heavily obfuscated, appears to be a lure related to a 'toxicology report definition'. The presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=toxicology+report+definition PDF link annotation
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/9b11425379829c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f90623bcc501.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/6785499.pdfIn PDF document text
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/afe5b65b61556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f96f90fe7fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fad44f2a0a6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32543990-da08-4c73-94f2-dbcfe049411f/36315051836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f97caf-e44f-4d58-b73b-a0302add3412/rulufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0b5ff7-7e37-4890-9cc1-358325558a45/78742151168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edec41d-2eff-43f3-b92b-80c885869799/letra_m_mayuscula_y_minuscula_para_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f039025f-6ed6-4a5a-901b-30d56e641fd7/gamugujigimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771c80ad-09c0-4611-89c5-9e3d4e6c08a5/wiluliruvetodos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 5052 bytes
SHA-256: ef4fce6df48d80583025ff0391cd1acf72de2a8a9a099f9486d35f27da3578b9
font_01_sfnt_off0000c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 10092 bytes
SHA-256: fc68081f32269f5341950262e8db316e2a9e5101912865d744576beaa8b2b47c
font_02_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613

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