Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb89a00bed45d6f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 12:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a13b7b081a8a4854726356db96153d0 SHA-1: d12292a8db87f2295d78eb852ec1e55f5e2376e6 SHA-256: 3cb89a00bed45d6fb5cffb48f180e5db894edf78b913330f71ef03b9e4bcb452
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, which is indicative of a malicious document. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack vector appears to be a phishing attempt, likely delivered as an attachment, leading the user to download a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://webmakler.org/userfiles/file/12329419468.pdf In PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/felagedukegolanorazebew.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/48375728573.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fifiniviwe.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/15464773545.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/sijidivafilari.pdfPDF link annotation
    • http://mweb.cz/images/file/71478848982.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/zafuxi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/94004408956.pdfIn PDF document text
    • http://sb-78.ru/files/file/mibizomakewupetem.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_A7512D3E075AEA0E.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xifofopamunudizazoraj.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/pikazevikitokavagi.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/12220717435.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/kesajuwedubexavoz.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/vawunadetosasenamosofa.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/ruvolodanas.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/35864976143.pdfIn PDF document text
    • https://trexanh.net/upload/files/leposawarozibiko.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/91856552560.pdfIn PDF document text
    • http://showdoimovel.com/files/files/43465917419.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa748e3bb4---betokabopufiw.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/26626275083.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf157bfb59---nodisusaleler.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/kuwoborul.pdfIn PDF document text
    • http://devveb.net/userfiles/file/padibezed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+install+human+fall+flat+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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 10664 bytes
SHA-256: bc76cd702a92c1d839923e4154bc33bfc70e732ea29dcd8ffa103c6b800be3c7
font_01_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 14792 bytes
SHA-256: f93efab01f36ce9ee71bc4a57ed24fdd2ec9b5378b7d307054e849ed2a97a588