Malicious PDF — malware analysis report

Static analysis result for SHA-256 216d980273cb333f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 00:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f5f1f15413c7e469306063ca479f5a0 SHA-1: 438a8e0843f2aaa8f4aa5b2e01105fb35f22e795 SHA-256: 216d980273cb333fa3bd3aa55b341226efb19014d9c7c52901e0fc4a4a7dd0b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to its use in executing malicious actions or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://zoncmswebsitebeheer.nl/files/editor/file/16938034719.pdf In PDF document text
    • http://tanabuauto.com/js/upload/files/85800191863.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/gulezajijumedi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259cd9c40c---mafijimi.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10771986524.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/lazevepavosukubedo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f420a444bf---welag.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/57932071646.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/nujedenukura.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/woxubusagomi.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090501080573499.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/pileviborubela.pdfIn PDF document text
    • https://krusomying.com/data/file/17182294766.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/bibiru.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/69260239234.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/pefepedabosuxozijob.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/30661425542.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/wujaxivozafokobede.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/11591047011.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/wofujevitudavuzis.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/turunaxonizorejazopejof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+move+to+ios+app+on+androidPDF 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_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 18088 bytes
SHA-256: c0bc7084ca39674ef87de422343a6bd7e7558f7c08f9ef9b254b8a90cc87d59d
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10748 bytes
SHA-256: d21b38bf98c4448d02c1e2f1a957d066aea27f5a632116252c314b11ce9a982a
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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