Malicious PDF — malware analysis report

Static analysis result for SHA-256 633f1a71a422ce4a…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 19:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eb674ca90d842941387e043639beba6e SHA-1: 760f28aeaafe9e6003c5b2a7093a6d20f8241a5d SHA-256: 633f1a71a422ce4a2ab90ba68a6ca0e571fed9faeeb3d55ba97e6094c947f5e9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a formula, likely a lure to disguise the malicious intent of directing users to potentially harmful URLs.

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://bologen.ru/strik?utm_term=volume+of+cuboid+with+square+base+formula PDF link annotation
    • http://bluetea.space/bowmasters_best_character_2020ke208.pdfIn PDF document text
    • http://avto-trokot.xyz/how_old_was_brandon_burlsworth_when_he_diedhdgzo.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/how_much_is_gta_5_digital_downloadomn1g.pdfIn PDF document text
    • http://muzoc.xyz/i_pilot_link_humminbird8e309.pdfIn PDF document text
    • http://elinekici.online/where_is_insinkerator_reset_buttonopg3s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_e0498e3dfbf444379c197be6b66b73ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a794f11-8926-4e6f-b445-6f61664282f7/64893422486.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_3d3cc14eaab44ca3b983c9ceebf72a6b.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_5610b78b2a6d480ebe0d9fc81bb207aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af2e0c8-2140-4e55-ac9b-73dcb6f6e864/nupetisunatu.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_da54bef270fc4ab095fa551e5453fbfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3469bfb-119e-4b5b-a49b-d8e17aa9ef88/62526384070.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_b0bd335cb979419c9d88e60812c90a68.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_8ae76132038c43eca7b3a45736d15f39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6523a4d9-07b7-4c2e-8c32-4fdd188b9972/45767446616.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_727f30fec8f4413bad078dfea3bf3433.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_0cb96c522a734dcdb3f50142ac3e41e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bea636c-2ee6-4f1b-8f1f-cbc2c6e5b2e5/sabanarudotudibavitu.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_356545e4052b46b5ab1cdd5c8e967a18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd79cec-6a84-4897-917f-42bc73746744/60364894282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5821ff9b-0083-4edd-a3a1-2f953e50ddc0/54253602216.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5584 bytes
SHA-256: 761d9cffbd9d5326cc4bd7f5dacd02adf324cdaac137fdb5473d1e34a1873a1d
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 11724 bytes
SHA-256: 2da8b1cb4bc2bf5269168d7e70ce4261ffcadda2bd1ee637e582cad5990c8d70

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