Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5737a6931e07ba…

MALICIOUS

PDF

70.5 KB Created: 2021-03-02 15:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: aa87e33ae810eeca61154ebb19eabdbc SHA-1: 10fd48808fdd344cd2e013546ce0d944fb89a0c6 SHA-256: ca5737a6931e07baa57de1bc8e16661249597a97d87a0456f4df6d6d1b8924e3
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to S3 buckets and other domains, suggesting a link farm designed to distribute malicious content. The primary URL, 'https://bologen.ru/wix?keyword=gcf+and+lcm+worksheets+grade+6+pdf', is identified as an SEO redirector, indicating a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://bologen.ru/wix?keyword=gcf+and+lcm+worksheets+grade+6+pdf PDF link annotation
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/kigalebobuvodopipije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fcd0befe7c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5ff5459284581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5ff9ed36a3fec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_60025bea39554.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/jezobasit/58181921563.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/50991336258.pdfIn PDF document text
    • http://defafezo.epizy.com/dokebefuzafigolapajupinis.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/9th_grade_algebra_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/fire_fighting_robot_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/87641662332.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/lexego.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/bukhari_sharif_in_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/53269869593.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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 5912 bytes
SHA-256: 7a318da303f91829ab4c443ee13adb45bbfaf7559041b73fc8d9b394b3df01d4
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10108 bytes
SHA-256: 6caa2a493045bdbbaa23da74eea03c0213dede8bc96fe43752dd6ab1f5cea089

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