Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b1d306d3429b9e…

MALICIOUS

PDF

87.3 KB Created: 2021-04-28 18:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f08ff7d416cd328281702c3025daf0b SHA-1: ff442b84fb624c8752b91693c8cfd08d7c9ed640 SHA-256: 20b1d306d3429b9ec4dd095ce66747ebb32c0e0dca7d242a4ff905a3066c23b9
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://midufefew.ru/strik?utm_term=what+does+caterpillar+rash+look+like PDF link annotation
    • https://cdn.sqhk.co/mizogujuzo/EvPhfTh/30839252130.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/ec292b2b192e25.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/NhdwifB/swamp_fox_theatre_showtimes.pdfIn PDF document text
    • https://tedurupezatijex.weebly.com/uploads/1/3/4/7/134757343/refifaz.pdfIn PDF document text
    • http://donovorax.22web.org/lowosegulenuzifedetudexes.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/zerapovagabozixuxe.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/dutamaf_zawinosaxupete.pdfIn PDF document text
    • http://gunonoxuketevel.22web.org/whats_happening_in_disney_world_2021.pdfIn PDF document text
    • http://wegolurubakisud.22web.org/vepatejufebajanifusima.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/507152638d8718.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/zozofufulolig/a_gathering_of_shadows_page_count.pdfIn PDF document text
    • http://tivapatovike.epizy.com/dodalimawafagujuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/como_identificar_a_un_lider.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/xodedulatafadixokimedefe.pdfIn PDF document text
    • http://musarozopod.rf.gd/53650356921.pdfIn PDF document text
    • http://fanuzisi.epizy.com/rudasukuro.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_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 5236 bytes
SHA-256: d30e164b9e5dd634942775bb139aa967f61b0eb8850d2a9b45094110aa6963e2
font_01_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 11700 bytes
SHA-256: 1c5169eee301ffa3c90b9d87b1ca5221859ce4dc1d3399a2aef17bfe9d106505

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