Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbc7398ce0b9538…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 13:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bad7ade5d0dc5922982c676e67dd455e SHA-1: c2af40bd875a6ec359b56f3ba70117b11d7d576d SHA-256: fdbc7398ce0b953842b256a9631f087ed10714bcfc449f01322e8c1222d3f313
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs indicate that this PDF is part of a link farm designed to redirect users to other malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for phishing or further malware delivery.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=dolphin+show+game+8 PDF link annotation
    • https://kimcert.org/E/file/dasaviligunizor.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lekupatetaxatojedavevexi.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/26582627304.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fusibexepox.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/tonifuvuxib.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/26655299219.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/78524644961.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gagawutokilewufadij.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30010615940.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/fabokawaj.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/fotafe.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/21174387227.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/27756189279.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/91053058916.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vetelikamiken.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/wadarebumikopagukog.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/xaxaramenawufusigegifike.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/ginonom.pdfIn PDF document text
    • https://viceda.com/userfiles/file/37099358390.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kawotadiden.pdfIn PDF document text
    • http://foxadv.net/file/96526916215.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/43107092027.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/69023644432.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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 17696 bytes
SHA-256: 9b6f3abc8880754a1cb3c102eef79f93493fd7d935b9da0778f0504788a0a214
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 10796 bytes
SHA-256: 34256f5b70c978c1d9e75464b479722937741b89bc35a88cc5dc3013d46f21b4

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