Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b329e89510b9ad…

MALICIOUS

PDF

89.4 KB Created: 2021-09-14 21:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b159e1570f614aa276f872ece06f7f5 SHA-1: 6943ed1ff92018eb97d5b872155888948220c65c SHA-256: 12b329e89510b9adf72eff7c4520695a9a07b37c5c7ed1a2c31c837b11c18b6d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://predial-rua-nova.pt/056-CovadaLua/images-editor/file/13204456039.pdf In PDF document text
    • https://worldmedglobal.com/userfiles/files/bojugebopegozigi.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tasibo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/76592054163.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/53110381943.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gezunogokajajugonebutaz.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/28330447853.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vabunikovuzifutake.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jamotadupadajenebav.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qvco3ml1i8gj0d8pt1c61lfjb2/pibinixapetodem.pdfIn PDF document text
    • http://trieuduong.com/images/Download/80996516124.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/18867415718.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zejise.pdfIn PDF document text
    • https://izr.fr/files/nozukafexixikiwuj.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jagurimigutama.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210910_B7CAF8DE25B95513.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/44721428934.pdfIn PDF document text
    • https://comfort8889.com/upload/files/mutoligepakogosunevun.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/rugisobamumedozoxurek.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/36122753908.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/18932686059.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/wunenaxizesex.pdfIn PDF document text
    • https://anfauglir.com/images/file/bomivanomijidupirogurizup.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/12185501930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=install+apk+from+pc+to+phonePDF 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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10696 bytes
SHA-256: 89de159d64c4fe5d12f6e9bf1db9142cb5444354cb36137ccd1fb45bc909790d
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 19564 bytes
SHA-256: ad26198c5f463f88f11de53e3b0d97930febbd5a173836ec4c23795106b7e5fe