Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1e6edc3b03150…

MALICIOUS

PDF

68.6 KB Created: 2021-01-05 05:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a74ffcb2e0e8e7001db0d35b4071f87d SHA-1: 1e052f7b71793f0a4bc6584488ce12221b7b82a2 SHA-256: f5b1e6edc3b031503f3b48e68318a58967ab4279f6227136bdbfc93d4ef6a87f
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to redirector infrastructure, including a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary redirector URL is https://cctraff.ru/123?utm_term=is+freezing+ice+cream+endothermic+or+exothermic, which is likely used to phish users. The ML classifier and ClamAV also flagged this PDF as malicious, supporting a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=is+freezing+ice+cream+endothermic+or+exothermic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5fe8ca706db52.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/funniest_names_for_children.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/70688860071.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/dalaran_wow_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f8a2133ec1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f875ca5d3ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5f9277a5dc117.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/84328574465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fddab953b283.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/41565247403.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/grading_percentage_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5fe0f4b9293ae.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/bejuluv-xizelu-tanubizagolumiw-tesufef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_5fd1e18bd56af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 5

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 5456 bytes
SHA-256: 4f455b34f675057b8311fadc2255584107a0a446905a7a9f69dda28273cd2906
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 10908 bytes
SHA-256: 3cc626bd38de68d0a6fb9a3a4506abdd5548d374485e9bf66dfc2803daf5e9bd

Open this report in the interactive analyzer, or submit your own file for analysis.