Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1544bde354a441…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 00:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 588b782ea23efe3fe8207c997daf97d8 SHA-1: 4398807766e79a1b300251f7d96d84a28fd42bb6 SHA-256: cd1544bde354a441b9cc66f91556031b02cd60a180c2918f974fe66f7c869597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm designed to direct users to numerous distinct, potentially malicious websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to lead users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://cryptobasics.biz/uploads/files/fokepinuzaxebutibisemejen.pdf In PDF document text
    • https://tadimtursu.com/image/files/rasasekakot.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/tesusasozabudal.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/78241776713.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/21048613152.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/jufapamogodasu.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/wimidupix.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jisatupudidekobaju.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/kusis.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/36356969310.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/nameguxejatak.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/37685743614.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/77743089220.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13753004374.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/25922325433.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd88961a3---35421694850.pdfIn PDF document text
    • https://orrizon.ru/images/file/ruzomukokupawiru.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/58559070444.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/nepejesirosoledazokoneba.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613792667ec56---wefomuwidobemosa.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/xexusazo.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/sofowagagibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=usb+bt+joystick+center+apk+fullPDF 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_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 11056 bytes
SHA-256: 099d9405ed6d096cadc4a35761a3a0d5840c599ac863d84d656b463a89c5a971
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 21316 bytes
SHA-256: 17a2757f2fab05481eb401acbfb0cd0764cb9f86466787256930a465b297b07e
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1