Malicious PDF — malware analysis report

Static analysis result for SHA-256 325a954c4fed0637…

MALICIOUS

PDF

71.1 KB Created: 2021-03-16 22:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b49ebf179e7258fe0b4f51ee1d547c SHA-1: 1467171bede752249e86a8cefd092b789f9fee8a SHA-256: 325a954c4fed06371805690d961a0573dfef962851cf7ee8c6d272a920781f6e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, with at least one, 'https://baarspo.ru/123?utm_term=volume+of+cones+worksheet+tes', appearing to be a lure for phishing or malware distribution. The document body, though heavily obfuscated, suggests a deceptive pretext related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=volume+of+cones+worksheet+tes
    • http://kixumitusomu.iblogger.org/pabanekefiza.pdf
    • https://cdn.sqhk.co/dugelabomaw/d2hcAhc/tambourine_eve_dance.pdf
    • http://mosomupusafebin.medianewsonline.com/top_startups_2020_london.pdf
    • http://kutatit.getenjoyment.net/74202948867.pdf
    • https://cdn.sqhk.co/xeviremal/gjhfigb/first_electric_motor_shop.pdf
    • http://galosidijixiwu.mypressonline.com/kenmore_ultra_wash_quiet_guard.pdf
    • http://mukedasimewiri.22web.org/gomituwumobisozojalilemas.pdf
    • https://cdn.sqhk.co/wirowanorax/ZSNQ97v/football_chairman_build_a_soccer_empire_mod_apk.pdf
    • http://wosatonosefenaw.iblogger.org/69294585730.pdf
    • https://cdn.sqhk.co/gukawaki/hihzFsu/zombieland_2_madison_bitten.pdf
    • https://cdn.sqhk.co/mozulunilex/1iighid/first_bus_information_phone_number.pdf
    • http://xipevufizokev.iblogger.org/cellules_caliciformes_intestin.pdf
    • http://rinujajija.getenjoyment.net/sosimin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9728061d-75e3-4107-9ad4-c0cdf0e01431/22005994655.pdf
    • http://mekebinaga.rf.gd/42736252859.pdf
    • http://vutikasozimot.epizy.com/79086550338.pdf
    • https://uploads.strikinglycdn.com/files/a0921c3e-8fd3-4db9-9c7a-bb63d96775de/daniel_goleman_inteligencia_emocional_cita_apa.pdf
    • http://vejabimumen.epizy.com/93957012261.pdf
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_f1cedd5985aa483abc3b5606bfc7a8e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8ef4bb8-82a2-43b8-b007-61611edfaed7/84709313319.pdf
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_21243508c172473e84c23319ae32bf28.pdf?index=true
    • http://tegofiv.epizy.com/chestionare_redobandire_permis_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e6.bin
1aab181f7c0e2939bbf83e01f765c01680716ad9662f7cd97c7ffa4d120b8ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 5032 bytes
font_01_sfnt_off0000e9f6.bin
c377601472bb1a6d9e1a2b309b75ef28730047fe279cce75d0088ef79fbfb9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 11376 bytes

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