Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5b1bb705efce80…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 17:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f3b18a8dc48526a8e0cb0f8bc2a7d5bf SHA-1: 2abcab74bac1eec5a7a0d1d2d64c551e0d44ab8d SHA-256: cf5b1bb705efce806c050a84277b744865191d3e89cd590f8ff1edd0704474f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://rtm-plus.com/ckfinder/userfiles/files/bavunufefaz.pdf In PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xivitikobubozobopegapaxi.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/zafoxanevipuxu.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109051021335163.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/25591597679.pdfIn PDF document text
    • http://119pump.net/d/files/xijuwezesetejitogovobix.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/37412869038.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/78641250362.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/23077538463.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681e0a2998---webinigofipasujukuwejode.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/77434005742.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/muxurorowogibonuk.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wifekenuzulixoninuxuv.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/nosewe.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/1464767025.pdfIn PDF document text
    • http://terrietanaka.com/library/files/gifisevifusowuxiniwikatod.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/duginejetasodemudu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138599f670f9---77580059321.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/tobinadagogijejikesij.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nigisexijexinusul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dow+jones+sustainability+world+index+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 17744 bytes
SHA-256: 477d9babaace6d34000b8937fe9c74610e6fdcc1d50ea02867e0fd36dffcd6d4
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 11164 bytes
SHA-256: cc8aee513f4a2189fc471736b1ed29a69ed3aa08376c5f5c1e362663e21e1d13

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