Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffead5c8741e04…

MALICIOUS

PDF

84.3 KB Created: 2021-02-27 22:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 77be60b44dd278cf411649fb3c0fd79e SHA-1: acfc1786bb3025d9b5f7b92f78c13ac46bb48077 SHA-256: b5ffead5c8741e046d1f472d42c625002b33ea838cb2023ddd72d3ad473744db
126 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 embedded URLs, many of which point to disposable domains and are structured as a link farm. The document body, though heavily obfuscated, suggests a lure related to learning Python. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a phishing or spam distribution mechanism. The ML classifier and ClamAV detection confirm its malicious nature, likely serving as a phishing lure or a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=how+to+learn+python+easily PDF link annotation
    • http://instgrmmverifiedbadge.com/nokiwotaq72fr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_6031f8af5a1d3.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/nelonuwef.pdfIn PDF document text
    • http://kulinar2020.site/single_gunshot_sound_effect_free_downloadaq63d.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/how_to_maintain_a_golf_cart_battery.pdfIn PDF document text
    • http://yandex-dostav.ru/62408550101ndyyo.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/does_roku_stick_work_internationally.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/pozivulap.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/3359457.pdfIn PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/suwodaxola.pdfIn PDF document text
    • http://study-english-05.site/390258114747icqb.pdfIn PDF document text
    • http://lazadacostumercenter.com/algebra_age_word_problems_with_answeb4yqj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5feed915a7c95.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/30588641317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_600d8c5a7d1c9.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/what_are_the_factors_affecting_school_community_relations.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/wozoxub/23771164983.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/menanibivel.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/tipos_de_auditoria_informatica_que_existen.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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 4852 bytes
SHA-256: 67ea3ef13bd3fc692bdfba29d8e87a4971174072bedb7af40f11e63bf939293a
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 10580 bytes
SHA-256: edc2d7a79dde250c301aa54c2b3ea301a06d318d2addd27ca4a286c20838561e
font_02_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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