Malicious PDF — malware analysis report

Static analysis result for SHA-256 435410df5cece824…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 15:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58491d2fa74720b95cee9d992a843e9a SHA-1: 573faa492db018c39b37a6c024a0e359ae7c4272 SHA-256: 435410df5cece824eea143572d9fc9ba04aba353ddb28db48a3a552d4db91579
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of external URIs and the overall structure strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=format+a+partition+using+cmd
    • http://artemon.nl/userfiles/file/boneripuwilakaxevilasa.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bapenetefukuvifiseza.pdf
    • https://ezokniga.com/uploads/file/37562822910.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d272e811b7---5194952448.pdf
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/55824501461.pdf
    • http://kccmaul.com/files/files/81626703258.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/betixido.pdf
    • https://dialogueinpraxis.net/files/docs/98204928579.pdf
    • http://ehomeforeclosure.org/images/file/bugorigotisogimawimira.pdf
    • http://skia22.ru/pic/file/75587539008.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/daguvujivame.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/35918667959.pdf
    • http://sity-luxe.ru/userfiles/file/bafuwitewuvedesogasuwel.pdf
    • https://firesystem.ro/imagini_ws/xazaruvarevupoxudame.pdf
    • http://satyamtracparts.com/userfiles/file/giweket.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c874a2f19---56450894843.pdf
    • http://zajazd-broadway.pl/galeria/file/degob.pdf
    • http://kvbm.org/pds/userfiles/files/82971311286.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vefoleviwafegugomobabej.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/6725737741.pdf
    • http://seoulgreeter.com/userData/board/file/5715340597.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/gamegu.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1631395490.pdf
    • 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_off0000d6c1.bin
54fa4401dc4dfbf4bbed2d2c2cba7e59b57d7c475f45ee5f9222867ea285dd4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 17944 bytes
font_01_sfnt_off0001053e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 16792 bytes
font_02_sfnt_off00011d55.bin
310d08194497c798f01170a10569c8368dd2ab3d7e7ae97360088a7d55a4a757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 10756 bytes

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