Malicious PDF — malware analysis report

Static analysis result for SHA-256 8476147536d36f49…

MALICIOUS

PDF

72.1 KB Created: 2021-02-16 00:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e86b044debd9c2e6e119fe4c1774e58f SHA-1: 5c2c6d83cdd1e7d2961f24ba9af1e0564ec8fea1 SHA-256: 8476147536d36f49ae70f55da3fb869d1a73a5c7f41ddc3c1149344b564338fe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title 'What is a breach of trust', which likely serves as a lure. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=what+is+a+breach+of+trust PDF link annotation
    • http://wewifodajukovu.iblogger.org/phonics_revision_worksheets_year_1.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/hhfthdW/weather_liverpool_pa_17045.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/lojabunoripe.pdfIn PDF document text
    • https://fupotitora.weebly.com/uploads/1/3/4/8/134883452/sulijo-nojalovibenow-vulajewenuk-laxet.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/dcgjf4n/14144056047.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/minecraft_1._8_9_crafting_guide_mod.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/ratibivomes.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/6355498.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/448fb4fff8521b5.pdfIn PDF document text
    • http://bujinolemisizam.iblogger.org/doodle_god_apk_android_oyun_club.pdfIn PDF document text
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/ed381e50.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/WhcihL9/17470824337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzeburim.epizy.com/demanda_de_amparo_indirecto_penal.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/lajasujagitolupir.pdfIn PDF document text
    • http://fosarasopu.rf.gd/19985832946.pdfIn PDF document text
    • http://fopekexu.epizy.com/football_world_cup_2018_teams_list.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/mupetem.pdfIn PDF document text
    • http://pamidomepimebop.rf.gd/besujavefojijuxewiri.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/the_entertainer_sheet_music_guitar.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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 5088 bytes
SHA-256: 3597400e6690e393b2b36389d81feacd180be448ef45d6c630b979e9660fdb3b
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10400 bytes
SHA-256: 79293c8f214040fc3658d083f8f69ce830101c6632b17599bc10f89bdc6e8136

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