Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f41198fa08a1c76…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 17:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bca0efcd730b07d355cca01fea1603d SHA-1: 174c1ff2104476180913f7bce4a1ffafead5cdc4 SHA-256: 2f41198fa08a1c76f2bef458d7a2e381de02227ccb396b81c624aa3de3ca98ca
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://creteotels.gr/FCKeditor/userimages/file/tirojatege.pdf In PDF document text
    • http://galenbio.com/images/upload/file/jezevuvekunuw.pdfIn PDF document text
    • http://labonscafe.com/userfiles/56152552727.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/59265740795.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/lekijominubag.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/2237427028.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/17825765007.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/86203572165.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/80307325622.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109040845374886.pdfIn PDF document text
    • http://szm.hu/userfiles/file/lovefudekolebaj.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/1502244021.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/zaduvewokowuwiza.pdfIn PDF document text
    • https://botroul.be/uploads/ketomagomilewabesemixujuz.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/sekefubovaxulivujate.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/98024361795.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210918200918.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/96946087579.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a1a56e1---46833229609.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/nemexabebujato.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bb786e64---wukobanuforumavesovi.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pisomitipuxonibigixodix.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/suvowax.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/23451297425.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091618375842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=head+hack+tabletPDF 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_off0000b4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 14520 bytes
SHA-256: 234a56362b2cae52297eb31a3a0dfd5960914eb5320dc041a3b9cc4ec30e2e80
font_02_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10108 bytes
SHA-256: 2775de3e744590985ac650e09dabcd811d1ac509527a0eed4e05f4f2f10935ff