Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b05cc3dd67b2e96…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 11:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21e5c4d85985ea66ac8f3974b08fb03 SHA-1: a3a0a84c972fc908f5a1c926448ad5799cf8bb96 SHA-256: 4b05cc3dd67b2e96fb78a9450e93e4432b297712bab53111131de77c926b2e95
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a significant number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://nipisod.ru/123?utm_term=bach+gounod+ave+maria+sheet+music+free
    • http://idealica-co.site/fixing_sheetrock_cracks846wq.pdf
    • http://pe50off.info/what_is_non_commissioned_officer_in_indian_armyqjxoc.pdf
    • http://findattime.com/how_to_program_games_on_a_casio_fx-9750giijp14m.pdf
    • https://cdn.sqhk.co/linidivez/AhfjeBX/afk_arena_realm_of_denial_lost_prophecy_scroll.pdf
    • https://cdn.sqhk.co/turomixo/jjiii9b/46067455384.pdf
    • http://sayfelengs.space/23757654087aqdm3.pdf
    • https://cdn.sqhk.co/nuduniguwufo/iJifUih/multichoice_diski_challenge_results_2019_20.pdf
    • https://cdn.sqhk.co/bapisolel/rgibdha/vepedijezumot.pdf
    • https://cdn.sqhk.co/vefusujix/jcjLia7/world_war_1_deaths_by_year.pdf
    • https://cdn.sqhk.co/togixulala/PrfJiiD/bascom_avr_free_win7.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/djeBoZd/76234871751.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/Tzhfhdh/punch_sound_effect_button.pdf
    • http://ig-copyrightnotice.com/40289803755wk2x7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_0274fc9c4e784ef3afac624f18e096c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f538640-cb0d-4caf-97ed-40e25c0228a1/zaxebatinid.pdf
    • http://babudenipovux.rf.gd/12315740795.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_dd9be7d61f604b69ab4301cc6fba5fdd.pdf?index=true
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_12619304472343068bee291cdceb20b3.pdf?index=true
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_f3933f9458874ff0af0cc35e17c4e356.pdf?index=true
    • http://fumojaw.epizy.com/decomposing_fractions_worksheet_free.pdf
    • https://uploads.strikinglycdn.com/files/e596647e-af07-4463-a3c3-3a209369066a/gifepakawigin.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_off0000fd4e.bin
ef1ce976b0e95501c8ce3fd10f611034224333979ff2b2fc05bf102a0b51f423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 5512 bytes
font_01_sfnt_off00010fe9.bin
d911a7e1baa76ba51835cf8b28404488a606eb380f38fc03c42bd1aca550f4b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 10852 bytes

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