Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff976eec03c8744…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfbe07bf4a8fe65718ac958f8edc6e3b SHA-1: 7a656bcc3fe7ae48d039515b5347193d35fe8c5a SHA-256: 5ff976eec03c874464639129b418e8630b12cae1f11023ed8bcf7212328b848c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=plant+vs+zombie+apk+pc PDF link annotation
    • https://tsydesign.com/userfiles/jws/files/57949279092.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/kalawisinugetuwufezuk.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/97114307956.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/34816634186.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/68768077675.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gewomaguverapewakudo.pdfIn PDF document text
    • http://only-svet.ru/upload/files/nepilepog.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348025b06dc---42370146559.pdfIn PDF document text
    • http://pedraferro.com/files/files/xajifexanide.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/guvixamadepesekusarujek.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/49623328216.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/lefufifiwofarojakiz.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vunenazetur.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/84806983553.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/46611fab0d7df5a068320e9ea374f684/xusude.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/55351374867.pdfIn PDF document text
    • https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/19823778082.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gatizukogasilezigi.pdfIn PDF document text
    • 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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 17756 bytes
SHA-256: ff71c47f0025c61770b6d4380a8430790fcc7000b20f216418b087fad7b0f1bd
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 10796 bytes
SHA-256: bfa1cb5c0b13f615c9671321ccf3356c712b7250ea44c40f3f375022f969b583

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