Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3326f2dae510e0…

MALICIOUS

PDF

86.4 KB Created: 2021-03-08 21:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 501465069032f818bee0caf61fc592c3 SHA-1: 67d5050ef13f12d96a462b55bf5bc628332b846c SHA-256: 3c3326f2dae510e0c03b0ba250b161940dfca2c57f8d5ca85b93d8b199515e7f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm hosted on disposable domains. This suggests a phishing or SEO manipulation tactic, aiming to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://resalured.ru/award?keyword=evapotranspiration+measurement+pdf PDF link annotation
    • http://znakomstva69.space/how_to_light_a_jandy_pool_heaterser7t.pdfIn PDF document text
    • http://bridgecommerce.com/pezumijamogjg4h2.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/9390174828siox5.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/zuvaruferapavizezi.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/rabukisud.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/xotali_difisavarojo_govokesibixaj.pdfIn PDF document text
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/radaxozasi.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/b3d80d5a3fb96a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_603cacd5a4410.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/7577072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_601ae443f3740.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/nesovawokugituxipaz.pdfIn PDF document text
    • http://idealica-ituficiale.website/lavurorubelikerigq3q30.pdfIn PDF document text
    • http://8bitbeardsco.com/97547538296sq7h0.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/2469737185jzcq7.pdfIn PDF document text
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/dopijakafojux.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/totulitorotow-pefabosox.pdfIn PDF document text
    • https://vonekinorosasox.weebly.com/uploads/1/3/4/7/134732286/b14171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 5172 bytes
SHA-256: 4b83810afc0b997703fb7005238b00d9fff41d6f10783e8e38dfc7e93a0d5f8e
font_01_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 10460 bytes
SHA-256: e3b565f6a676cb8fd45e4671e28a6d23f29bb0061bb3b133140fd07347db4483

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