Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc53bf150d7c33b7…

MALICIOUS

PDF

99.6 KB Created: 2021-09-10 18:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 395dec1e2d25638585f4b473667211a3 SHA-1: 778d068222a302e68af69c7d222b4b7e9fcf6b1b SHA-256: fc53bf150d7c33b767ade15ea2d11cc40147b9ba5fa6a56552bf6ca1796a301e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=android+vr+split+screen+mode PDF link annotation
    • http://protectakoteasia.com/ckfinder/userfiles/files/25916480853.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/62384846042.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nonuzulofoxevetesoziw.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/89643446842.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/88993677463.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/silajilazagaramuref.pdfIn PDF document text
    • http://gekon.net/userfiles/file/nijatik.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/4842721663.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/1582888343.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/68959245287.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/mumisurob.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/dipesefefalubuju.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/13363127628.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sivetejiberaz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300093657c7---lubozabisobobivejat.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/20800501441.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/pezotazuko.pdfIn PDF document text
    • http://eternoohydro.com/d/files/nogakipexorofupaxuliruv.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/26259734301.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/14819773155.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/66908558269.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pipabajinerufujonegi.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/wokadisazumefa.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/fizoxegomotejif.pdfIn PDF document text
    • 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_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 18508 bytes
SHA-256: d1d2197dec086a904737346ce7a1547817c277a7895a1e53d233bc82499ecbc8
font_01_sfnt_off0001506b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506B 10560 bytes
SHA-256: 750684c9396394230990441d64aa4c0a9d7ee5fdb9307344bee3eb531163b428
font_02_sfnt_off00016884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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