Malicious PDF — malware analysis report

Static analysis result for SHA-256 34800373cbcd8835…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 07:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a8a6a5ce53c5ee1df17e45507196e31d SHA-1: 11cbdf0b8c86f145fb63d22b10cdbcbc70a99bdb SHA-256: 34800373cbcd8835ddc20375d7a3390edcc4dcdb6a679a6abc6339c9030116ee
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/award?keyword=eu+annex+15+pdf PDF link annotation
    • https://cdn.sqhk.co/fekerepusa/jhihZhj/2019_usa_road_rage_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/3bAaCxh/voxakinawaxug.pdfIn PDF document text
    • https://cdn.sqhk.co/tezabulaw/ggjaShb/89964704320.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/dungeons_and_dragons_races_dragonborn.pdfIn PDF document text
    • https://cdn.sqhk.co/wakunexigoto/pbShjgj/arcade1up_street_fighter_control_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/ctzmBy2/air_tycoon_online_3_open_branch.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/rchasja/crossy_road_disney_download.pdfIn PDF document text
    • http://zakofuta.66ghz.com/3490693487.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/5FHxJav/business_management_problems.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/intex_pool_filter_pump_instruction_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/QjbhabA/zulesizegowifego.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/52468001570.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/E4Gjhjf/kowepomozuxatokoxuriv.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/NhdJicb/labidejekamawubumurukos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_e3df5681458943c186a1b32d2f26ecb4.pdf?index=trueIn PDF document text
    • http://texazufuvo.rf.gd/domain_and_range_practice_worksheet_answers.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_44857343457f47e6a9d2a5bac11d4543.pdf?index=trueIn PDF document text
    • http://jiwunix.epizy.com/65997558031.pdfIn PDF document text
    • http://tofufelu.epizy.com/last_of_the_mohicans_takes_place.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_69fbc74cd31f46af81f31426716deef8.pdf?index=trueIn PDF document text
    • http://fuvamawijivef.atwebpages.com/kopipatuvit.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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 4928 bytes
SHA-256: 996c7d76a0009859b90bf546a7218ae4c2393b2e95890518466a08365cf4c764
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10688 bytes
SHA-256: c9af0966924c13ed2382bbd134d79d23d55603e08e8b660fa7688a019b1bb8ad

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