Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f5e22218c55deb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 16:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99bab70f80c38f4dd0d6b73d444ca6b4 SHA-1: 6157ae33504d094585174c758b6f4acd6321a9a3 SHA-256: e1f5e22218c55deb671984aa2990346962bc6e7eb47f6c5242245d9a34e89181
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm of other PDF files, as evidenced by the numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://pxmonastery.org/CKEdit/upload/files/liguromezo.pdf In PDF document text
    • http://www.urbanwaterways.info/files/26629303170.pdfIn PDF document text
    • https://pixel.bg/img/file/19932592863.pdfIn PDF document text
    • https://peterdegendt.be/file/45331965620.pdfIn PDF document text
    • http://askort.pl/Upload/file/90141787071.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kafovix.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/kegasilifuximerobulaneli.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/buromukekiw.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jakolopodujesizutofaxaw.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/25325054196.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/83133345766.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/94902126611.pdfIn PDF document text
    • http://rentaruedas.com/files/others/pamekizefalawuxe.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/lekepokugov.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3c47c5dc89fb8133572235ac15fb2337/97483427113.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090115185273499.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/68438575046.pdfIn PDF document text
    • http://apart1day.ru/file/lijokufutupos.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/37176137970.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/10130731459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=file+transfer+using+wifi+directPDF 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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 19056 bytes
SHA-256: 2c26944b1ea393ee3d7e68eefadad10c9b543e409aff976bf7aec04e08d9868d
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10692 bytes
SHA-256: 5f55183e3b86ba44993d0f60369361d44fd25247c3cc888baeef6a172d19deda

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