Malicious PDF — malware analysis report

Static analysis result for SHA-256 da47f0ff6d177b7c…

MALICIOUS

PDF

94.6 KB Created: 2021-04-30 19:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: adec3a4dd4a8035ae56433eca626a99d SHA-1: 2634eec2a7204c0f0da7db1dd5368cd4eaeb441e SHA-256: da47f0ff6d177b7cc7a5944c20922e8e445b600d0ccd27fe0c3368f39be99356
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary one pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=trigonometric+identities+and+equations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491933/normal_6035838aace6b.pdfIn PDF document text
    • http://sanasesuj.iblogger.org/23250672555.pdfIn PDF document text
    • http://daxasukivebo.22web.org/arabic_letters_flashcards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447107/normal_5fe2b7042b518.pdfIn PDF document text
    • http://dogolojowazovuf.iblogger.org/26382627424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_6057ec9a5a23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_5fd124d14d83a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesidif.epizy.com/32692472945.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_2d51b3b7996640348a02ed57ddaf50f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/toro_power_clear_518_zr_wont_start.pdfIn PDF document text
    • http://puxakuxuvon.epizy.com/building_information_modelling_for_construction_delay_management.pdfIn PDF document text
    • http://jirataser.rf.gd/becoming_a_supple_leopard_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/zupemivivinagi.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_4997fe64e2ed483eb741e9f1ffd549bb.pdf?index=trueIn PDF document text
    • http://vabetinedivuto.rf.gd/honda_rebel_300_for_sale_arizona.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4dd44719a52b49d982d70a57b94f2808.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0f3ecd77eacd48938ba97ae88b251d4c.pdf?index=trueIn PDF document text
    • http://radoletoma.epizy.com/3817849396.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_to_clear_stock_in_transit_in_sap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 5304 bytes
SHA-256: 7add2f43f41080d94d16d08dd6fa7d424e47bb01417f2a10eda5ebd534e26113
font_01_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 12496 bytes
SHA-256: e2786925d861ac80d96f85090c45d1b28ed4f7f334526fc794ed1d986fd7ffad
font_02_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 16072 bytes
SHA-256: f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3

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