Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb32d4abf6e668…

MALICIOUS

PDF

80.8 KB Created: 2021-04-16 03:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5544519faf3e6cb3905b8fd81eaa4e44 SHA-1: 9153adc1e5d05cfdf82e27507b1e646a174e9018 SHA-256: d3bb32d4abf6e6686c575976679e6a7de729b2d9180332ab0de6152e866801f5
226 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to various external PDF documents, many of which are hosted on disposable domains. The presence of a 'Password-protected archive handoff' heuristic suggests the ultimate goal is to trick users into downloading an encrypted payload, likely after being led through a series of redirects. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=serato+dj+lite+download+64+bit
    • http://bebalezuve.medianewsonline.com/boorse_health_as_a_theoretical_concept.pdf
    • https://tiporedoxuva.weebly.com/uploads/1/3/0/7/130740235/lanub.pdf
    • http://detonic-ufficiale.website/plc_siemens_s7-1200_caracteristicasnced0.pdf
    • http://dogalijun.scienceontheweb.net/roots_of_quadratic_equation_worksheet.pdf
    • http://believes.space/amcas_applicant_guidejluzm.pdf
    • http://verifiedbadges-form.com/olympus_om-2_battery_check5jf44.pdf
    • https://pobasejedewepiz.weebly.com/uploads/1/3/4/0/134017346/tomiramivefoto-pikukevabarux.pdf
    • https://cdn-cms.f-static.net/uploads/4470689/normal_600a82c503c87.pdf
    • http://vepenuvix.mygamesonline.org/print_october_2020_calendar.pdf
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5ff7815f51fa6.pdf
    • https://cdn-cms.f-static.net/uploads/4487641/normal_606851a5a8441.pdf
    • https://cdn-cms.f-static.net/uploads/4475847/normal_6027bfaa59acd.pdf
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/jaxug.pdf
    • http://xeeewq.xyz/befeforop4lsm.pdf
    • https://cdn-cms.f-static.net/uploads/4403948/normal_60426dbd444c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dumupa/bolbitis_difformis_mini.pdf
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_9842e14ba77146c4bcbd0ae1c39276b0.pdf?index=true
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_fed698d11eb54ceb907598349d2782e7.pdf?index=true
    • https://s3.amazonaws.com/kewakuko/decorative_plastic_sheets_for_windows.pdf
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_5c70592c2c0045e2afd0a8939d34108f.pdf?index=true
    • http://xutenasejubibe.atwebpages.com/98261979290.pdf
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_983eeac2c3c349ceb91ee6ec904cbfd0.pdf?index=true
    • https://s3.amazonaws.com/kozibowisenatu/avadhuta_gita_telugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc7.bin
3ade47e5de51783080c78ff3becb6c0fcc2451785b27fdbf917c7e8ea2e4c324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 5292 bytes
font_01_sfnt_off00010de7.bin
4ee9c8cda19f9828bdc63465e216aacfe8a9cc967d5ad8774bf2ebcda19d43ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 11832 bytes

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