Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425d84213cee73b…

MALICIOUS

PDF

91.7 KB Created: 2021-03-03 16:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a755d396ef169175946f09ea5b82b404 SHA-1: 1a3c10397828e5451a8dd6002a1aa67017ae0336 SHA-256: 4425d84213cee73b03b31616032f5e63030c1bcb9d0366f79dd0fd94511ea91f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, suggesting it functions as a link farm to distribute traffic to various websites, some of which are hosted on disposable domains. The document body, though partially corrupted, contains keywords related to machine learning, likely serving as a lure to attract users to click on the embedded malicious links.

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.
  • 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://mezovuduw.ru/award?keyword=practical+machine+learning+project+in+python+on+house+prices+data PDF link annotation
    • http://neridofufuleteg.scienceontheweb.net/how_to_become_medical_laboratory_scientist_in_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/iggc8jj/durixijesemovelilogesuve.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/fheZejg/52836501856.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jgEghjW/carx_drift_racing_mod_apk_2018.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/xijokazoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/WiiEie9/foosball_slingshot_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/Uia9gjS/youth_road_bike_races_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/pOjf69m/4319884855.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jf22hgi/retrograde_meaning_2020.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/7a513a663e.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/Ljb8icx/lezafe.pdfIn PDF document text
    • http://wekifojedopike.22web.org/kokotoxofeboma.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/sojofo.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/pafekuxirikuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/g9jcjdf/top_hit_songs_2019_playlist.pdfIn PDF document text
    • http://xamawodub.22web.org/cervical_cavernous_malformation.pdfIn PDF document text
    • https://nifufoji.weebly.com/uploads/1/3/4/4/134458522/5536343.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://xowobovu.myartsonline.com/texas_saltwater_game_fish_identification.pdfIn PDF document text
    • http://logasexa.epizy.com/amino_acid_abbreviations.pdfIn PDF document text
    • http://guridej.epizy.com/32024950983.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_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 5548 bytes
SHA-256: c6c63fda0580ce37ce0215c48cbe952138e4c5b9cd1c15fac1ab3542afab06fa
font_01_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 13772 bytes
SHA-256: 646acd0af47a86754bcba3cb585e6e30d00b68a5d68d13eb29ba393d92a66b84
font_02_sfnt_off000152b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34