Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c877e3a833e0281…

MALICIOUS

PDF

78.9 KB Created: 2021-04-30 03:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d722c78b36fb09957f421399374fef9 SHA-1: 245c88f7ab32fc854dde8e32752a490a4bc87db6 SHA-256: 8c877e3a833e02811c0cb4e3833ed79cbde7106cd103a23ef265e4ffc327a7b3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

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://soxebez.ru/strik?utm_term=speed+queen+front+load+washer+reviews+2019 PDF link annotation
    • https://cdn.sqhk.co/devisofage/a6jgxhj/le_singe_mange_des_bananes.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/gosuxinudowugezemamir.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/lofasasenipim_refud.pdfIn PDF document text
    • https://cdn.sqhk.co/riduwadanu/Hzget3z/59766304291.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/5874610.pdfIn PDF document text
    • https://tababara.weebly.com/uploads/1/3/0/7/130739165/9435223.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/kuxuzele.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/2232687.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/uichegg/nuforimevafoxavanux.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/ihNWWdL/73131592774.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/57280150054.pdfIn PDF document text
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/13df8.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/4297196.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/jibOpgh/doxenilop.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/birukibusunebexaguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukilaba.myartsonline.com/administrao_financeira_e_oramentria_download_estrategia_concursos.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/vomol.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/common_core_sheets_fractions_relative_to_half.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/nakofaxetexexadaniketak.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/bofozomolivap.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 5992 bytes
SHA-256: 6ba2005dd9f4a74475680a87bcee4277e252387c2f66fff1f1e7a97ccb3d974f
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 11856 bytes
SHA-256: adb00e203ed2c2b03d23d2b740a4b2c26451b797177d1fa470de430de64b950f

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