Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dce7567e34b003…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 06:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a09043c181f6527fbcae8820960e78 SHA-1: 26aff1f6991e088be80ae9bf83c1d1ca4bf16615 SHA-256: c4dce7567e34b003e3901812b720dd08943b0b7c645733e8dd16da8c6385c86f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or redirect users. The embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+to+cite+a+published+interview+in+apa+7
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/nezuku_diked.pdf
    • http://silkhfig.bid/23743777842s5ozp.pdf
    • http://naliputa.mywebcommunity.org/how_to_do_six_sigma_certification_in_india.pdf
    • http://f1l3download.site/new_house_building_checklistyyg48.pdf
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/danexuneje_fimivavosir_jofifotas.pdf
    • http://fanilobepewe.sportsontheweb.net/monster_2003_where_to_watch.pdf
    • http://xufamorazogubov.sportsontheweb.net/baby_girl_dresses_for_wedding_party.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/04204148e.pdf
    • https://litisenos.weebly.com/uploads/1/3/1/0/131071047/jepowosido.pdf
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/3158717.pdf
    • http://twenty-promo2020.ru/introduction_to_information_systems_5th_canadian_edition_test_bank4wbte.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_24cc4cc01b1e4ce7b7769e673b0be0c7.pdf?index=true
    • http://jomurire.epizy.com/wokateg.pdf
    • http://runobukep.rf.gd/tesis_sobre_administracion_publica.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/what_does_the_spotted_lanternfly_do_to_trees.pdf
    • http://mifofoxidil.onlinewebshop.net/kobezew.pdf
    • http://gevapugono.atwebpages.com/candid_photography_tutorial.pdf
    • https://s3.amazonaws.com/nawosineromigi/can_aggression_be_a_good_thing.pdf
    • http://xuxereda.rf.gd/pojisezilatowonula.pdf
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_20c234c0f3ca4e658e1cf768e6e46129.pdf?index=true
    • 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_off0000eb1c.bin
1afd2168f06d067c96d19a453c861c7b3995390eca6959869a1c7ffb8a579d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 5496 bytes
font_01_sfnt_off0000fdd8.bin
16ef0b4bc259039ea0565bcc984f389268baf6a74e7252de275c7781d4b4103a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 11172 bytes

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