Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d1e62d7831e5df…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 16:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c99dd89e0580c2896cb18763dbde88f2 SHA-1: 188e4b8db0633ff75beb639376baeae9c99bae7d SHA-256: 70d1e62d7831e5df78c0f74fa0813f0b49b77476e11004dcd63aae3283d4aec9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://medvor.ru/uplcv?utm_term=genshin+impact+working+promo+codes PDF link annotation
    • http://hosteleriayvending.com/ckfinder/userfiles/files/sevozenulewomata.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/katojuwedixutuduso.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/zemetalaleka.pdfIn PDF document text
    • https://izometal.net/mm/file/92458845098.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pikegumajerodap.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/54302661851.pdfIn PDF document text
    • http://qdcmd.com/data/files/buxotifom.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48326423511.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/59109281685.pdfIn macro / runtime command snippet
    • http://www.drivingschool-brno.cz/files/files/dizibefozuritelev.pdfIn macro / runtime command snippet
    • https://stl-log.com/htdocs/cljr/data/files/62797660216.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905153456596142.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/zikosafavepukizo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a33a24237---tidepuvovilafuje.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/pukulilipes.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613735efa89e5---bulum.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/zumino.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9024735446.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jejazi.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/nokijalotafogikexebugo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/77584112603.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/foxibafefixunofazita.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/fixufibogojurapeteke.pdfIn PDF document text
    • http://grossbuch.com/upload/file/vader.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/44585841971.pdfIn PDF document text
    • http://sangjeom.com/userfilIn macro / runtime command snippet
    • 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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 18776 bytes
SHA-256: 3486c202d5ba0f7dae40b443401bb5f22d887cefec8f8e53946a3b71ceb35ba4
font_01_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 11132 bytes
SHA-256: 21cd1bae813d3471cdca5730ad9dd83c6dee0b25c9d5ce02876f8f2943439b01
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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