Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fa566cbba01130…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 09:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf8da31f9b7da793406a72e31129fa5a SHA-1: da3a4ca00884e211f9ebe5e815d2cc99a02aa642 SHA-256: 52fa566cbba01130a1ed51ffbd162ad662d3203579f24cc2e5b92a60f252c0b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fazedu.pdf In PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/giturefovepis.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/faruwuxamofipabufuzeviro.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/90786804345.pdfIn PDF document text
    • http://philipsphotographystudio.com/61349131279.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dulexa.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/79341705968.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vimuvowelajazeninegeseve.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tisesunasu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139851c71b4b---33520313948.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wigowuduwurivi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/wobameber.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/41649567455.pdfIn PDF document text
    • http://ruresept.ru/files/file/32348428333.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/78472638405.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/tasidikorod.pdfIn PDF document text
    • https://cityface.cz/res/file/17456921531.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/lumelifipogab.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/bejusovugi.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/sabopego.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/18876438696.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/segeripa.pdfIn PDF document text
    • http://keramann.ru/uploads/files/luxudirekiwopifimixudiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=el+arte+de+hacer+dinero+mario+borghino+pdfPDF 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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18944 bytes
SHA-256: 280d70b464a7c659ba48b80d4a4f4c23d38709cddeab51ec2f560c93703a4cfd
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 11020 bytes
SHA-256: 8464d8517e7f4e83e80ef567da29840bb07361b3bef046d0807723631040df18