Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf6ce2257f2b8af…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 20:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5bad8b054f2832af5555ce4ac89811e8 SHA-1: 4d8656d452499323efd781eec4ff397a9d82020e SHA-256: 9bf6ce2257f2b8afab2eeac1d5ce8b1f5105ac256282010692e0319762053984
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=hyderabad+pitch+report+2019+in+tamil PDF link annotation
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/sulediruxono.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/zobonekofodoro.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/Ongcjfk/drag_racing_boats_for_sale.pdfIn PDF document text
    • http://azalea.store/how_human_depends_on_the_environmentyw9ly.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/sezisi_zokeketubowat_wabaf_xuzosabutowev.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/kiwazoliz-walowik-wikas.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/HhbMrgK/mobatekiraxudedi.pdfIn PDF document text
    • http://fitit.space/personal_statement_samplecpauv.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/welepidilibi-pukediliget-sisubiresemuvig.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/tepogexitero-wironinomux-dogimokozojawu-kelufekidusoji.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/fenukoxegonumidex.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/5165507.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/ic2dig9/kamevojabosaxawun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegafiloxor.epizy.com/regugolonezujoze.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/zexawurukiduma.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/what_class_is_a_regular_drivers_license_in_ny.pdfIn PDF document text
    • http://mulumibapetemom.epizy.com/female_swimmers_body_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/pesutedonufevidi.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5820 bytes
SHA-256: 89b186fb578b27f0134c76a9ea0a6f190ce984d0a39336402396cb117260f2a2
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10120 bytes
SHA-256: 5e66089da104464c46090907d510080e831992f2ef3615c522b5f12cbe59fd47

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