Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf00855a5e93d95…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 16:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a5e7422378be4a207e877086faeb121c SHA-1: 0ad412fa971c9bc93f9712e11bbd52492cd6cc9f SHA-256: fdf00855a5e93d95d36b1cd2bce459355380088c7fc7d16fa444a4e3d18d6415
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, indicative of a link farm or SEO abuse for malicious purposes. The primary lure URL, 'https://baarspo.ru/strik?utm_term=the+wise+man%2527s+fear+hardback', suggests a phishing or malware distribution attempt disguised as a download. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=the+wise+man%2527s+fear+hardback PDF link annotation
    • http://womenit.space/puvaxo4y7m.pdfIn PDF document text
    • http://registrat.space/xagopivomurotapuvaemvvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374199/normal_6004fb8cceda4.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/aimersoft_video_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/gjejegi/word_scramble_finder_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_6007951684b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fe0116651216.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/eifheji/master_system_emulator_android_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fe79b1b68b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fcda5d996407.pdfIn PDF document text
    • https://zodukaveg.weebly.com/uploads/1/3/5/3/135345947/femolalozuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nozulorot.epizy.com/ixl_answers_algebra_1_u._9.pdfIn PDF document text
    • http://vewamade.rf.gd/baldi_s_basics_kickstarter_demo.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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 5508 bytes
SHA-256: 8659c07cf6d98c582bae15aeddb1b915c77a65b9383d68ccd3ac21b45d01a381
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10500 bytes
SHA-256: 8ea048c245e5b20a5c1d120543896a1ca2f3a7f5f89816daeb67ef83af45e3a1

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