Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3164b87c981a72…

MALICIOUS

PDF

89.7 KB Created: 2021-02-22 17:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f741e00fc46bd35fb013e338ed35f170 SHA-1: d1b8260badaa92a006206a29ca4f1a5dafc43b6e SHA-256: ae3164b87c981a728d64209439e520cc12d21282eee6c1a358b45dc3dfe4fd77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as SEO-friendly URLs, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=does+sandy+die+in+jack+reacher
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5ffde9fbbdfb4.pdf
    • http://doordash.fun/dolos_do_corao_elyse_fitzpatrickcidvf.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ffa16cf83cf4.pdf
    • https://cdn.sqhk.co/veleviziwew/hcjaygi/9462617369.pdf
    • https://cdn-cms.f-static.net/uploads/4470688/normal_60132fc6ca40d.pdf
    • https://cdn.sqhk.co/pujixefan/jjHihSn/68827214278.pdf
    • https://cdn.sqhk.co/mamevugixej/oihhaa6/dilolifedakesom.pdf
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/209e5630.pdf
    • http://shopsmmv.site/prophet_shepherd_bushiri_booksn06x2.pdf
    • http://italy-small.space/74282163579ijpz1.pdf
    • https://cdn-cms.f-static.net/uploads/4506170/normal_6016e2fa6c4b1.pdf
    • https://static.s123-cdn-static.com/uploads/4419645/normal_5ff2ab1140c05.pdf
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/jabopatev.pdf
    • http://kieverts.xyz/109548666017rm1f.pdf
    • http://bridgecommerce.com/xefaxolexalenigixk7hu.pdf
    • https://cdn.sqhk.co/biposuba/Xdhchdg/36532244416.pdf
    • https://cdn.sqhk.co/xiroxozalal/hcwzUMN/espn_pba_bowling_tv_schedule.pdf
    • https://cdn.sqhk.co/botonerepap/hi64jcG/gatab.pdf
    • https://cdn.sqhk.co/kifuzopeko/RXDwiij/easy_fire_truck_craft_for_preschoolers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011fb9.bin
255bda83aa63c326c61bdfb62bd77a206a62aef87ad977419ede55285b81ade4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 5236 bytes
font_01_sfnt_off00013199.bin
1a434f68e1fee3652b2dc24f3e6916020a998b149e5c936339855feaf872a3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 11656 bytes

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