Malicious PDF — malware analysis report

Static analysis result for SHA-256 333c17f50e2e34df…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 12:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a917a9ba2966906b5bb71a9ff46c403 SHA-1: 1afacb41917674447f562c4239225bbf5ba00b64 SHA-256: 333c17f50e2e34dfcf076a648ee3d08f249c1407a2734d7af437e90a53abc27f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous URLs, many of which are part of a link farm designed to obscure the ultimate destination, and one URL specifically mentions downloading a live football app, suggesting a social engineering lure. The presence of embedded JavaScript, though not directly analyzed for malicious intent in this report, is a common vector for exploiting PDF vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=download+live+football+app
    • http://wksx.top/images/userfiles/file/56718955768.pdf
    • https://showdetango.com/bafa/userfiles/file/jamelejew.pdf
    • http://orvosvalaszto.hu/uploads/files/wefogonoju.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/bikaturojusobenuk.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/7659341303.pdf
    • http://torremaggiore.sitmap.it/files/files/60332639149.pdf
    • http://mertcelikkapi.com/userfiles/file/99492670032.pdf
    • https://marcuspietrek.de/MARCUS/files/file/61746821562.pdf
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jivazimoxirubi.pdf
    • http://worldtile.net/jangheung/userfiles/file/16455009286.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b748bd7a85---zetuvigubigipasoludurixa.pdf
    • https://wildarium.com/ckfinder/userfiles/files/punovesujet.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/95562402617.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/88565035900.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b534f1db80---52581859291.pdf
    • https://listocrm.com/userfiles/files/rodag.pdf
    • http://ambulanceservice.pl/userfiles/file/56059400701.pdf
    • https://fcimoveis.com/imgs/file/fepakekuwax.pdf
    • http://snbedu.com/uploadfile/file///2021090520323645.pdf
    • http://petra-koparki.pl/Upload/file/51455389296.pdf
    • http://rracc.com/file_media/file_image/file/51833913137.pdf
    • http://bannhuaduong.net/upload/files/80066711661.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/nazimowukowevi.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_off0000b07f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 16792 bytes
font_01_sfnt_off0000c891.bin
f088b4bc0e9dbba2d92ee4040cedbd0a2338414463b2ed1b0f888b05f6776fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 15336 bytes
font_02_sfnt_off0000ef75.bin
3f77edc6e9ce42b24537d9da919cd7b8ec6fd00185f07f908c2613240d0bb575		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 10516 bytes

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