Malicious PDF — malware analysis report

Static analysis result for SHA-256 63818a84e41d5bd4…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 16:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9f11abd544ae3d328ccd28cbe3926227 SHA-1: ce0678a02da0711ebe53ea18fcd3e96a73a8de30 SHA-256: 63818a84e41d5bd4eb14c0ee564235e9a348f0fe97c700c19277bdde36ac1015
196 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is designed for SEO link farming and phishing, with a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs, such as https://jacksth.ru/award?keyword=proform+fitness+bike+tour+de+france, are used as lures to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely involving the exploitation of PDF viewers or social engineering to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=proform+fitness+bike+tour+de+france PDF link annotation
    • http://vandify.com/ramanofubawakogul7iatv.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/nosilinorojitikosunuko.pdfIn PDF document text
    • http://qqkaxes.xyz/42467490143lv24c.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/4761895.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/458990b.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/xupozurimumeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/budovewesekaz/nnamdi_azikiwe_university_post_utme_form.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/sample_case_study_interview_questions_answers.pdfIn PDF document text
    • http://gepobot.epizy.com/sumerian_cuneiform_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/engineering_economy_6th_edition_solution_manual.pdfIn PDF document text
    • http://difavaxegugadu.epizy.com/zunamimiwolatawawisawek.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/kujafozipovubi.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/spatialite_osm_raw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5224 bytes
SHA-256: cbe3642c7648e562e2b135de4b3e4803afbfbb89317a4b1624af6bcbf7f64bc3
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10180 bytes
SHA-256: 38a288cb434ddefbf987b282470196cedfb8a9a9a280e5c0408a4d8672d330c9
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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