Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1b86c53aeae6aa…

MALICIOUS

PDF

69.2 KB Created: 2020-11-24 02:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 64822e841392131975000f617e523dc7 SHA-1: 40462bb7c0f5069b3c8d0623bfffc46750c68c49 SHA-256: 3b1b86c53aeae6aa6365931ce1bf57ac5ffab9274915ea5fcbef9ee349e42417
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan distribution attempt. It contains numerous links, including a critical redirector link to 'cctraff.ru', which likely serves as a lure for users to download further malicious content, such as the PDF found at 's3.amazonaws.com/jebokizez/doraguzif.pdf'. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive content.

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/strik?utm_term=microbiology+made+ridiculously+simple In PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/rilerufulubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_5fa4630697014.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/5612751.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/sugawen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f9edd4ce35ab.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/wotiruzi.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/samuwozasana.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/jebokizez/doraguzif.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/99408335535.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/platformio_get_boards.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/marketing_management.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/50640954140.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/befewagarime.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/coccidia_in_poultry.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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 5640 bytes
SHA-256: 6278d6c117e4c08fec45fe6f497fd57544469de54c37fc49d0d36e6fa46be422
font_01_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 10420 bytes
SHA-256: d8a69cf11717a907f7ccc9d3d3e69d66c5bfaa7e6ade9ec4538c7420c1c029cb

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