Malicious PDF — malware analysis report

Static analysis result for SHA-256 049e782fb9616b20…

MALICIOUS

PDF

75.7 KB Created: 2021-04-10 09:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1e445b853e426370ca0775619761265f SHA-1: 218b7fa287a7b9c9f895f0ca48e813e80ff616ba SHA-256: 049e782fb9616b203edef3e5e957a420232590c96fb4fabb5abb3ef2a82db1d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external domains. One such URL is https://botokaw.ru/strik?utm_term=after+msc+salary. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=after+msc+salary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fed670d6cdfb.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/hjhvNha/41597140970.pdfIn PDF document text
    • http://kuliwajijet.22web.org/wapumirodoxijaxumekik.pdfIn PDF document text
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/1558a6eef.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/fisivefelo-bewuxuzini-wafivib-vusim.pdfIn PDF document text
    • http://matorebaxemipiv.22web.org/tixexinepitemekesipame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_6066c8e856004.pdfIn PDF document text
    • http://newoxinap.66ghz.com/xebajenexokawodipefana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fe62becc4d65.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/1d0a633c6824d.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/foxejezunuvigewiz.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/e19e14bec1.pdfIn PDF document text
    • https://jiwumakot.weebly.com/uploads/1/3/4/2/134235931/gababozam.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/jetonatawijemur_dapunajenema_sawolupejoviwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb88141568.pdfIn PDF document text
    • https://bikekifo.weebly.com/uploads/1/3/5/3/135304891/gijodogiturekum_dulamutuxin.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/5961692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_5fd7a60ac815a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/highjja/dixofesaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risusod.rf.gd/english_vocabulary_in_use_advanced_third_edition.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_086548aabc0e4f6ca2e8a6fba60e5d25.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_f43634bf450e4849af80db6f58f9f06c.pdf?index=trueIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_a0920a87eefa45b6acfa731d9b2d2797.pdf?index=trueIn PDF document text
    • http://vuzogumav.rf.gd/mutudigez.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_b0a916ffe6cd445b9cdc0b97e83691d8.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_1f9c4e4d283540a99e2971cd1ef05354.pdf?index=trueIn 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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5120 bytes
SHA-256: 465d24f73628d91d2a3053b25bbca6275fd517d212e9587ec24669f7bf80effe
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10644 bytes
SHA-256: bd99c7470beff1d59d179a6e84abbe3dfd4d92a5eb5358ac19181bfcf37ff3eb