Malicious PDF — malware analysis report

Static analysis result for SHA-256 f944a80decd49ac3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 13:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1c00b764f1e026bb7772c3438a33fee SHA-1: 6cf1f4ae7c76cf6377e12f6ac45914e009e53982 SHA-256: f944a80decd49ac3bdffd81c1c625b60b1ef8c0848a0b5e3350ce0ce7abba09f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded content to redirect users to malicious sites.

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://krisoc.ru/uplcv?utm_term=how+to+change+lock+screen+wallpaper+in+redmi+note+9+pro PDF link annotation
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xifoxujomatedubefamabilap.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109052033073407.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/nakogaganenoxosoluw.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nuzujij.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/taputimolifesunuwanid.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bimeguk.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/78675978498.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc5b43950a---zeturoremonanozolepudoso.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vajulovo.pdfIn PDF document text
    • https://dyaa.club/uploads/file/41782704136.pdfIn PDF document text
    • http://agilesolutions.in/uploads/74758305285.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614adedae5050---20759783636.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/82219087406.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97822112630.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/15671589224.pdfIn PDF document text
    • http://gibisch.org/files/files/xaruralini.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be170b225c---guregebik.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/futibis.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/faxifo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/39847187398.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/rorumufi.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/sitesevexuvumoze.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/8955725205.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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 11296 bytes
SHA-256: 3032694226052da4f28544fbb91acab738566e78c197d9a2f28032a741381ab0
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 16076 bytes
SHA-256: 59d4791efdab2d2031a6a2797aecc257e6e6f84ec730f02886cd0974ed08ae0e
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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