Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6515608d64319e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 03:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4ef6ee308544886bf1550151710047d7 SHA-1: 8fbe7ada656532ee5a2fc012a0e81f7820aef5b2 SHA-256: ac6515608d64319e83d3cfca1c40b7cb64d586329136fec217c659007e7620bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://burelomdo.com/ckfinder/userfiles/files/xazawarufudiboj.pdf In PDF document text
    • https://ceccardolj.ro/userfiles/file/sijikuvorije.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/1034565070.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/45198772375.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vakezovupuz.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/33189989669.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/15087971900.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/33186998761.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273fb8a978---81021248390.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/pizunipubalakigubi.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/90027242531.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd735453f---9466753152.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/28999452123.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/buvolimimerurukiwikija.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/15310490116.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/9406281618.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/16283744552.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/26171466973.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/pakikokelisotokofomos.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/fenevoragusoma.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/55906584652.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gadukumelinidulelago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lightroom+cc+apkPDF 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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 10420 bytes
SHA-256: af2e5379aaedaf94d593870bb37b6d08b9514334a386cbd39e25a467f7d6cb7c
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 18952 bytes
SHA-256: 0910805dc099860e8f845720cc127a40b6397fa2a7b0e191bd9cd1d83ac47c3d
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1