Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22cbc08d3391a19…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 13:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f061816d839bd8dc951b187228c3812 SHA-1: bde625237643ab83c0bfdd0a10b5bc470e3645b2 SHA-256: e22cbc08d3391a19463ed01d53f00f09dfcf52c038448bdc6c88c33e21bcc893
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://leonvi.ru/award?keyword=budapest+tour+guide+pdf PDF link annotation
    • http://creamwalls.space/lenuribimatebadizagimg0ch2.pdfIn PDF document text
    • http://erogan-encolumbia.site/why_is_it_important_to_follow_instructionwcqbw.pdfIn PDF document text
    • http://ujjjrrrrr.space/posulujunexejofijufift0cp6.pdfIn PDF document text
    • http://praktika-ingenieur.com/948403725745cc3c.pdfIn PDF document text
    • http://sberpodarok2020.online/22450776221p3j0s.pdfIn PDF document text
    • http://devgm.design/4238280595v9nmd.pdfIn PDF document text
    • http://filemarker.store/spacex_starship_testrw3g1.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/pusejuzivix.pdfIn PDF document text
    • http://bigpleasure.ru/debubegigewdjoiv.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/vetedimoviwijonojolukopajqe8mt.pdfIn PDF document text
    • http://trokot-new.online/407042164931mq22.pdfIn PDF document text
    • http://istlan.fun/996587532qag8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedudo/cisco_email_security_virtual_appliance_installation_guide.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_60bb456a54a94ae2bfb5993b66489a87.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_9b246ed9549145e2ab7e9e744e759916.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovigebi/43445140447.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/fidelifadavanuramibox.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_abb0f2ef008c4746a26063857df9b437.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/tesujurago.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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 5224 bytes
SHA-256: cc8a9238681092f55113507bf9d4663e392e986e37e9240b77d43a5d9081255b
font_01_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 11856 bytes
SHA-256: 06c12c087d43321f24fb795b42d309172dbc4dd50e6fd8a19427d0d3bd6db9bc

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