Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b3e8fa926aefb…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 18:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6828af001e0f5aeced833f7927d870e SHA-1: 7bad1093e11775aad92812d591849c368548be85 SHA-256: 8f4b3e8fa926aefbd281ded9936e0c1bcffede8f43b0190a2a9fcdbb63a32cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as part of a link farm designed to boost SEO. One of the primary external URIs, 'https://mezovuduw.ru/123?utm_term=free+sheet+music+with+guitar+chords', is flagged as unknown reputation and is likely the malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=free+sheet+music+with+guitar+chords
    • http://zusiwibewire.mypressonline.com/z_table_critical_value_calculator.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/assemblage_charpente_bois.pdf
    • http://bifugejif.22web.org/fifezufotebugefiwomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/49396930-3378-48ba-90f0-7dc61c2a88ec/35153817369.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_ace0103d521a495c9a36d9224373ef75.pdf?index=true
    • https://s3.amazonaws.com/mevuzokekenojab/what_was_lady_dais_life_like_in_ancient_china.pdf
    • http://luregaw.onlinewebshop.net/cesarean_section.pdf
    • https://uploads.strikinglycdn.com/files/916b4686-3162-42ad-8a3e-e945bb214cf6/descargar_biblia_dios_habla_hoy_gratis.pdf
    • https://uploads.strikinglycdn.com/files/314c4365-0e30-4dae-9235-f112a906b441/best_danielle_steel_books_2019.pdf
    • https://s3.amazonaws.com/muvemasoxaji/tijul.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_27ea84a466984cf3adfebfdf789711b8.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_9cff3e6094554d0e9a91a15997602cb9.pdf?index=true
    • http://sudebitije.rf.gd/how_to_solve_an_isosceles_triangle_angles.pdf
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_ceffa16d6ae04773a242a7baef55eae7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51a291da-31b3-46cd-98bc-261eb02e88cd/80751891823.pdf
    • https://uploads.strikinglycdn.com/files/ba553606-d65d-42c6-9103-06c5b74fd523/what_material_is_a_stress_ball_made_out_of.pdf
    • http://jopugobov.rf.gd/poxubeparop.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_db5447d0cc2f41a5a6ceb16d5b2dc426.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f501dad5-3804-470d-a62f-d3547b8cac1a/30503556997.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_off0000ebd1.bin
19949b6db0cd745b005c973ac1d6d10133c4f7af41f46a4bdb5fe583ce9fbf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 5368 bytes
font_01_sfnt_off0000fdfd.bin
cdd0d7ac1ca963592a020d0cc9e0676b4a96408b55e2fb080a13022c137c1b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10392 bytes

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