Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61ea2715dfb34ce…

MALICIOUS

PDF

92.5 KB Created: 2021-04-05 19:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8ce2257b0f0fd3b708bbd44c72f43359 SHA-1: d28714bcf72e46e2c4e72c3c62acaf47770ca132 SHA-256: b61ea2715dfb34cebdbdc6309e5cccbe210c3cc9ed7b7f74d553a04148fe9ab6
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The file's structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=android+development+training+near+me In PDF document text
    • http://viwoxufegoger.sportsontheweb.net/ali_baba_and_the_bongo_bandits_full_script.pdfIn PDF document text
    • http://okstore.info/basemutenabul9451k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_6044f4285b5c5.pdfIn PDF document text
    • http://sezituza.66ghz.com/come_follow_me_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_602784de1b675.pdfIn PDF document text
    • http://uber-global.com/how_to_fix_a_whirlpool_duet_sport_washing_machinel3gca.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/prentice_hall_biology_2020_online_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_6058ebe3dd23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_6035baf39b6b5.pdfIn PDF document text
    • http://nazhivy.net/87731319515mk96t.pdfIn PDF document text
    • http://prostotit.site/wewamuvaruratofatrd8ha.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/92603916288.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/can_i_learn_coding_from_scratchm9b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5fe89f1e43a83.pdfIn PDF document text
    • http://gifavojam.scienceontheweb.net/26283592652.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/18116854131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_604e55d3208f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_600c88d0db068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_6005b0ea7eb9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxelugokolutu.rf.gd/falling_slowly_sheet_music_piano_free.pdfIn PDF document text
    • http://nofisavopodupir.epizy.com/au_bonheur_de_ces_dames_ekladata.pdfIn PDF document text
    • http://votoromuw.epizy.com/graphic_design_the_new_basics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 5152 bytes
SHA-256: 9bbb6fc24528942a6d6a4bf19607897de797c1d4224c296bb3f538867202b422
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 11156 bytes
SHA-256: f3c923134031b66ac67db79adef74f382e49a68511a19d022607c9a160391156
font_02_sfnt_off00014d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D12 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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