Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d820b3fe73a61ec…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 05:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50397269d583220a30deff8e67b062f4 SHA-1: da0a6fb40fe07668faad2e0482de46845af17112 SHA-256: 8d820b3fe73a61ec49535fa43bad3e5e583f6e449c0ce1de1f26822c34abe400
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to use SEO tactics with disposable hosting to distribute malicious content, likely to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=asian+paints+colour+book+2020+pdf+free+download PDF link annotation
    • http://nutosuvitiraj.scienceontheweb.net/livro_administrao_de_pequenas_empresas.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/10493281031.pdfIn PDF document text
    • http://design-kvartira.info/mid_latitude_cyclone_grade_12lb2ba.pdfIn PDF document text
    • https://nugelemuv.weebly.com/uploads/1/3/0/7/130739301/a2013644938a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_6051ec1abb6ed.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/natural_selection_moth_lab_answers.pdfIn PDF document text
    • http://letgtma.bid/10967765359e07pi.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/xTx9Ijf/norse_god_of_war_daily_themed_crossword.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/5862174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5fd182246dd3c.pdfIn PDF document text
    • https://lidisujuv.weebly.com/uploads/1/3/4/5/134515282/826f6e643.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/ziagfhh/asefat_al_harb_gameplay.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/vovesufodemifikibigezod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe90b9addfb5.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/6934033215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_602a1e985ec8e.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/xewijaberebojela.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/uc3jeGL/a_hero_and_a_garden_jam_ver._org.pdfIn PDF document text
    • https://cdn.sqhk.co/furabafezuse/hcOihjf/71772222256.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/5632253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goxafebo.myartsonline.com/brahmacharya_sandesh_book.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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 5708 bytes
SHA-256: 41b008894a946697a4fc553f22b2ae16fd1328d277638dab0cd6614fb2e4b939
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 10528 bytes
SHA-256: b312ff31c8d9330cc63edcb625afd2886cb34fb6583e405f8db3f180587b7757
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1

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