Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f52d9d98ee98d4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 231feb5223fba7e67090df8a9f969302 SHA-1: 885b4187ba5b00f49bb6c4d251ee3a3a1d9717ef SHA-256: e6f52d9d98ee98d420789be1a5a8d08f8c5ba75a3f729d62aa817c9a6c4bb68b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV and an ML classifier also flagged this PDF as malicious. The presence of external URIs and the link farm structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dichvuketoanvn.org/uploads/files/98977180753.pdf In PDF document text
    • http://officinedesign.it/userfiles/files/37707867844.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jemuwofesobipuri.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/72203238354.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/xekakebuvubetimapulu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dimaxusosoza.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/motojugadenumeladolos.pdfIn PDF document text
    • http://africareview.in/userfiles/file/66180444685.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/peligemijesepe.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/niruwekemikozukagixudu.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/87467439786.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/55532807926.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/zalotosujelasenuno.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/57194566215.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/58189517981.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/97858330228.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/62377595191.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/jibemisozalikisivevu.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/55424397935.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/90718775201.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16136166d3dba1---jabezotasuwoxag.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/vezadifovajafum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=animate+anything+androidPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 17408 bytes
SHA-256: 1449cb277c456200c1b1dbff0015262395c7381ea741172b421988cd7bb8db2d
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 10576 bytes
SHA-256: a295ec2c5c91f4a717590ff0f58b316fa8547ee4903db25712de833d6ab0a91a
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.