Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a25a82f45aec42…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 17:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 669fb7ccccc373906499dc904ed57c2c SHA-1: b3d8b7f74c1f84839874f7a788d284521651256c SHA-256: b5a25a82f45aec4231c3578c12042058f59625b39b6813aa13ce4aa1c61cf4c0
146 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to various external URLs, one of which is an IP address. This suggests the PDF is a lure to download a secondary payload, likely a phishing document or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://langmypham.com/luutru/files/kofubadituzujovip.pdf
    • http://yuemeism.com/uploadfiles/files/89971990550.pdf
    • http://firegallery.ru/img/upload/kejavimatiwama.pdf
    • https://movie2book.com/userfiles/file/patuge.pdf
    • http://yejiya.com/userfiles/file/37317049316.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da994d55b5---figuko.pdf
    • https://equantumconsulting.com/files/files/kepiwipuloxesujesiresel.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xoduzibu.pdf
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/81874725267.pdf
    • http://slkuang.com/v15/Upload/file/202195542402609.pdf
    • https://denimder.org/resimler/files/25079644433.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139865b22b38---22798636283.pdf
    • http://energy-labels.com/userfiles/file/dowiferojupukinotefaxij.pdf
    • https://ntiverification.com/userfiles/file/dujetimeruxavukowomatonem.pdf
    • http://premiercontractinginc.com/files/file/jusotoketikaka.pdf
    • http://caytrong.vn/Images_upload/files/lunifapidokuzekiwunene.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdf
    • http://njbeihang.com/uploadfile/file///2021090711251220.pdf
    • http://www.elstar.ru/uploads/files/90853856320.pdf
    • https://delta-relay.be/userfiles/file/42767205510.pdf
    • http://healhumanity.foundation/userfiles/file/97775831790.pdf
    • http://brenno-tojestto.pl/userfiles/file/xisosifara.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613928c52a6db---19256083866.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=essentials+of+statistics+for+the+behavioral+sciences+8th+edition+pdf+free
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d543.bin
4f8e6600ce43755167c7e3b4eb9f34715423e243c5da5a3ebdd37bb3202e2c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 11116 bytes
font_01_sfnt_off0000eef3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16792 bytes
font_02_sfnt_off00010705.bin
f6719c3e4a12b0d6d9b3f38b8f172c42cd466f0db5e56407ef2d137f81d39f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 16832 bytes

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