Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d258e3a0411ffd…

MALICIOUS

PDF

75.7 KB Created: 2021-03-07 04:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0961c6991025bb718de88b777230a2be SHA-1: aba6932b58cae948c5562e21bbbe328174ebd684 SHA-256: 52d258e3a0411ffd6531b8acd8e9aaa0e3a41f05289603f852f5e5e81aaa96a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to study materials and software, likely serving as a lure.

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://jumiwimov.ru/aws?utm_term=how+to+study+orgo+for+mcat PDF link annotation
    • https://cdn.sqhk.co/jabosuve/hibiga2/rollercoaster_mania_cheat.pdfIn PDF document text
    • http://expressday.online/draw_tite_activator_2_instructionscyu3l.pdfIn PDF document text
    • http://reduslim-europa.site/is_nuance_cruelty_free0a45i.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/g0gdji5/pixel_dodgers_apk.pdfIn PDF document text
    • http://dakujuzoma.22web.org/khadya_patrata_parchi_mp.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/bible_study_on_the_blind_man.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/wooden_doll_houses_at_walmart35xua.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/iiidYij/dapuwifujojerato.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/peluwekudukutofujab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/futamo/esv_study_bible_commentary_online.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/idt_audio_driver_windows_7_64_bit_dell.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/origami_bookmark_heart_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/ladolisanutabukisupor.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/what_is_99_years_lease_india.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/hp_laserjet_1012_toner_office_depot.pdfIn PDF document text
    • http://supijidexigoba.epizy.com/dr._esselstyn_diet_guidelines.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 5464 bytes
SHA-256: 8b05b0e06127129df6e661a12e05007ae2dd8f5115bf237eeb96e306458651a7
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 11228 bytes
SHA-256: 7f38770bdeab75a802f4d2cdea644574ec40db06954165da963d506ce3e14993

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