Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8dd55ef903b708…

MALICIOUS

PDF

87.2 KB Created: 2021-03-15 02:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c87150ba1fbbba4e6138f7d24fe68d43 SHA-1: 308ae232c4b416a9df552a80787b1f6f18613c7f SHA-256: 3f8dd55ef903b708ab5555d86eb658d428423d75caf4b9825be68f69539447ec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wb?keyword=hey%20whipple%20squeeze%20this%20chapter%201%20summary PDF link annotation
    • http://jekeluxuto.mywebcommunity.org/jafozarekunorabuzovabujid.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/43390385404.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/ancient_history_r_s_sharma_download.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/biological_theories_of_crime_causation.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/bits_and_bytes_ace_academy_ece_download.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
    • http://wafovon.epizy.com/edmunds_used_car_value_guide.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_9d4791138ea54018a147a925e1b5cbe9.pdf?index=trueIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/68312422292.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_a619676a9b7e43898d2aa20439b27919.pdf?index=trueIn PDF document text
    • http://fuzaxexudiwa.rf.gd/making_renaissance_art.pdfIn PDF document text
    • http://fikelamizogu.myartsonline.com/mujowenidepaxaror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a398d7-a88c-4812-be23-2dde0d1533c8/diary_of_a_wimpy_kid_the_third_wheel_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/kufefalo.pdfIn PDF document text
    • http://fowevazi.rf.gd/90350140361.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/tirinaboropov.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/2021_ford_mustang_convertible_colors.pdfIn PDF document text
    • http://meresig.epizy.com/fobumuzegufalaketamut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bffa2d2-1c1f-46ff-9c12-bc43836203ba/all_html_tags_and_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9657e0aa-9e07-4e72-af93-31a88f47551e/xagabe.pdfIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_b1c2a7895ddf432789400f1af9426c68.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_884a7f1a28f046169f77ce198627c037.pdf?index=trueIn 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_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 5224 bytes
SHA-256: e49430d444c3d498b9e33ba2ec120001aeb2aa55616ad1abdf8d78bca5851bf0
font_01_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 10604 bytes
SHA-256: 6c684be4023a685c775b39d81e9b75b4f208e656604121071efb0b3a2a86fed4
font_02_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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