Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f9a2cff668815c…

MALICIOUS

PDF

70.4 KB Created: 2021-02-19 02:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 355ec1cfec5f7ed3a69a2c3cd6b3ec4f SHA-1: 5d9d2386c01f6e053e7b829fb07f25cec6a36e18 SHA-256: f0f9a2cff668815ced3edb8af60812825f8a74ab80d12f6445f180e9ec7bfc29
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links points towards an attack pattern involving directing users to potentially harmful websites.

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://jacksth.ru/strik?utm_term=toro+power+clear+180+gas+type PDF link annotation
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/af642bb6104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5fcaa7abe9981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_6004af33c80f7.pdfIn PDF document text
    • http://nazhivy.net/34597016042gqgjy.pdfIn PDF document text
    • http://reduslimitalia-official.website/885481893269hhfe.pdfIn PDF document text
    • http://topstop.site/escuela_biblica_de_vacaciones_2018a1cl5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff2d9205cd5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_6006901971fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6010c5c957a94.pdfIn PDF document text
    • http://tokio-2020.fun/88358715689xakea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikodanaso.epizy.com/showtime_rotisserie_cooking_times_pork_roast.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/lelopakinulupagofos.pdfIn PDF document text
    • http://zogiken.rf.gd/42586388880.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/viposevenatenegasasasomet.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/strata_committee_meeting_agenda_template.pdfIn PDF document text
    • http://kikivalisexe.epizy.com/online_marketing_articles.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_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 5632 bytes
SHA-256: 43f6bd3fce310133cab985aeea678650c7db9454155a469ad8a5c6c5793754da
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 11156 bytes
SHA-256: d2da08310f6baba1c5109aa1c9dbf39da641315d634b55f1928a694b843dfd7b

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