Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6a9889c310ab48…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 09:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1652e0972fc7ff544e6a7eb9aa68c6d7 SHA-1: b8b189dc289cb9373ce53b87d49e3908c55426df SHA-256: 8f6a9889c310ab48c239ca72c6f2425e1ecfdaea9f39cd96d14949a8023885a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/award?keyword=never+be+alone+partitura+piano+pdf PDF link annotation
    • https://cdn.sqhk.co/fasazani/iaQGaa3/brave_frontier_2_global.pdfIn PDF document text
    • http://mugowewu.22web.org/biblia_de_estudio_cristiana_evangelica.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/ifQKgh9/nilutan.pdfIn PDF document text
    • http://zadudafarom.22web.org/lego_challenge_cards_preschool.pdfIn PDF document text
    • http://dazinifuxevoji.22web.org/501974063.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/bhhPNpk/didosidaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/ibihIia/download_naval_storm_td_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/igdSghE/pac_gov_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/egcPYih/22161229982.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/qhivbMz/valofewo.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/hinjjiI/pixez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feriwodapep.rf.gd/janejaduvoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/mopiponavedidag.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/gummed_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/26966959624.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/times_tables_practice_worksheets.pdfIn PDF document text
    • http://nosajesu.rf.gd/how_many_carbs_are_in_a_frosted_strawberry_donut.pdfIn PDF document text
    • http://dilexaluv.epizy.com/free_astrix_deep_jungle_walk.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/pefarodopojumubel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 4908 bytes
SHA-256: ef5c5c633b7cea7789cb2f218c82ae0a4cf1df30dc299441892510e27eff6e61
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 12056 bytes
SHA-256: ff74748a8d4d1b2791b99d4c2d9a1506002f674c7bf4030cdbff5669189f45c0
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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