Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae153fa60840451…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03ccc224dad93cab08a53389e618d3bc SHA-1: 49b5070dee9c402c29e6372b8b72f7daa2460872 SHA-256: 3ae153fa6084045175732df783801304919ecefe28b5e13a3234ce096024985b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack. The ML classifier also indicated a high probability of maliciousness.

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://xezojetit.ru/123?utm_term=ww+car+cartoon+video PDF link annotation
    • http://mopowataxix.medianewsonline.com/nv3500_transmission_rebuild_manual.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/wupokewalubalapepirini.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/piwejavofodem_jadojitunosutow_zujavogixugomud.pdfIn PDF document text
    • http://yesstore.pro/gewanwh5c4.pdfIn PDF document text
    • http://kernig.online/gixivikotuzupixerimomenib4yigw.pdfIn PDF document text
    • http://eslife.pro/78810181797rhky5.pdfIn PDF document text
    • https://nopovufarake.weebly.com/uploads/1/3/1/3/131379277/vujirekovero.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/90899954838.pdfIn PDF document text
    • http://luminar2-download.xyz/fleece_bed_sheets_target7v88u.pdfIn PDF document text
    • http://kataeta.club/desi_bhangra_song_djtv4zb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jijulek.rf.gd/mijesovawawanupuva.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/tetedeja.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/household_expenditure_excel_template_uk.pdfIn PDF document text
    • http://guberiwexoza.rf.gd/rumigobug.pdfIn PDF document text
    • http://bolororufe.rf.gd/vanibamowijatepimuloxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 4888 bytes
SHA-256: 9e6614d04c33c7773c565d7c0c624fc120a6690f94e9017ecc1d55c725503312
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 2296 bytes
SHA-256: a45a47f4874d7d22c196c2d5614dd6d3931629bcaf4eeaf32be568947fbec78c
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10992 bytes
SHA-256: 93c502915b342386e24bc0b8272d971c35ba5bbb9bfe9bb765a83abda28f3da7

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