Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9617e70297b1c6…

MALICIOUS

PDF

78.8 KB Created: 2021-05-19 09:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19eb415290d6c6a938627557678daea3 SHA-1: e279b776a628ae793883ba1ede171ec16069c066 SHA-256: ec9617e70297b1c613e7bbb47b373db87902650650c5689f6384c34e363bafd4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'dafemum.ru'. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=can+amazon+fire+tablet+be+rooted
    • https://cdn-cms.f-static.net/uploads/4454422/normal_60216aad5f51a.pdf
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff25f6c23f20.pdf
    • http://zezarujewida.iblogger.org/89953781084.pdf
    • http://movilatur.iblogger.org/98647521944.pdf
    • http://vuliduku.22web.org/dewunajaxin.pdf
    • http://jirobanu.22web.org/science_fair_certificate_of_participation_template.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/2985456.pdf
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/dikuxekevitefa_rasowudoteno.pdf
    • https://wupirevedog.weebly.com/uploads/1/3/4/7/134709422/1cc893d64.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_60462476726c1.pdf
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/dogub.pdf
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6035deeff3b8c.pdf
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/6ce9a6fdb0.pdf
    • http://rakuxijewimafud.22web.org/1231010251.pdf
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/nevovejoj.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_603525b4b896a.pdf
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5fcc9c3591359.pdf
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fde835919a57.pdf
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/metezuviwepije_jewazate_zekafosap_jivomolowobi.pdf
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/8955072.pdf
    • https://cdn-cms.f-static.net/uploads/4460447/normal_5fd37daa8d0af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/norozovijalu/69589157403.pdf
    • https://s3.amazonaws.com/wetevali/brother_mfc-9970cdw_toner_level.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_off0000ea77.bin
96672f5e0faf322e94af27553aa2cebd30bd6783f9b18b4fa8999b43f9d3e211
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 4968 bytes
font_01_sfnt_off0000fb4b.bin
8046f3c2438fdf1a9200b166f3091ffa0f7b337016139b7d4330a7d196569750
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 23116 bytes