Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d9b1b7080e5be0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 18:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9a0960bf613522b570c3e898d36b4b84 SHA-1: c1e03a896d854bd85e8cc477bef37ad3bfa7a770 SHA-256: 29d9b1b7080e5be0a9a9c5d2a2b5f4790b4e965d6aaa8eb5a0418b69be6c5ff5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a compromised site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://at2-turbo-j3t.com/contents/files/jififenotelisusi.pdf In PDF document text
    • http://chemtron-vostok.ru/media/file/wigopupawatujoxilef.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/98611529895.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/36421467334.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/godenozavokitodagejedid.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/wenawagozapajoluxunupuzo.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wofuvutaludifigon.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/nirafowazupigupuv.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/daxikufori.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/dovitalepolutiwubasizute.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/45029404828.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/45182305588.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16169879471.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gofuvaxuzef.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kodarabawepezot.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/disaroxofumo.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/92866499078.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/58187395938.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/5369248814.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/7578551087.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/485909893.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bifiwakanusid.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/ligujuwekoga.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/5464939444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=qr+codes+do+beyblade+appPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 17104 bytes
SHA-256: 402ce283a78d77e4a8b5b855e86150ac014dbaa8c04b3b20fba04c005ca5c9b9
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10528 bytes
SHA-256: 3b7a67e9867be167fec1eeee7154b3807db17c44e82d90cfd1ec4194f0fce5bf
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1