Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f561e660a76c83…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 10:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 469a80c8298b05d353eb99871e600f6d SHA-1: 60fa13fe109e1b24562de44ace4888aaf64efe8b SHA-256: 48f561e660a76c83b11b1571c259a27eb8e00b7556bc7ffed7538227d48cd496
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gcr.goldcrownresort.com/magazine_files/files/nosexujukoxozavupi.pdf In PDF document text
    • https://valeaflorilor.ro/img/uploads/file/malipekoxos.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/29755603010.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/27482882628.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/xurozogeguvatominupipixa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613735294bfc3---58579445951.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/88043048160.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/togosolarukezoxexamige.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/39615152519.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109031525491947.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85549859463.pdfIn PDF document text
    • https://mkontroll.hu/File/pawizatexovatetar.pdfIn PDF document text
    • https://kopari.hu/files/file/43532643504.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/fafedapusonu.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/27612460448.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/jabepofagotule.pdfIn PDF document text
    • http://www.andreapondika.cz/file/sebipuwonuliwutuwoxudat.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/7403616516.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/zimik.pdfIn PDF document text
    • http://benetalent.com/upload/files/70695758586.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/fiterowifew.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/69724546406.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090320204870554.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/jigupelibiveloxuruzuler.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jaribakerikopasaxizeziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=barbie+and+her+sisters+in+a+puppy+adventure+full+moviePDF 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_off0000c5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FE 17260 bytes
SHA-256: a66207a49f606ba28c8c8d995e0adfc348bc92a59e5421a7dff97fb6c5d2d648
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 11236 bytes
SHA-256: b4268035454c4689e04dddff001e09b6bb6c6e243bd886ca83e5348d770a525e
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1