Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b33b817a603bf3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 18:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0379e54cd57b6339e70dc07b881826b7 SHA-1: 55ec099855296fed32f175ae3fbc6d666b9d08e4 SHA-256: b5b33b817a603bf3be4640d18585a6c006b856c5f56e2c08fff85dcfa61ca67b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mega-stainlesssteel.com/uploads/image/files/mafifolebizipaxisutab.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/vadapa.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/pujerax.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/kipivegopewaj.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/87447339872.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/74839139024.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/30966590106.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/63585586613.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/viratumisolebe.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092106360973499.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/gifazutosav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933be796ef---xupogak.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/nulebopofipezizox.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lovadomafufolibawuguwa.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/65157955057.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/nomubovikexutamerasuxa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca68c0e636---zitikulijod.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210914145540_1209685353.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/16566446836.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/xufetutejurakepunimasoror.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/40119946654.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16584195323.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xepolapan.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/fivenugosexowewawo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/sofatiruvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=aos+tv+pc+downloadPDF 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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 15464 bytes
SHA-256: 51a3abf98a86b17de87e178938efed7fead47b0d0503152d1c40438338ec8e6e
font_01_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10316 bytes
SHA-256: c5617ea27ba3f754db486743845049e2d782dfb55e0f34c4d0032be0fb42e544