Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f1a91d646f2712…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 13:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ca30d1a1b0b814d01653c4c2ec59d98 SHA-1: 53383c89b6a82df5749402b7c2860cc6fc581a3b SHA-256: d6f1a91d646f271262e26ebef628748d65d6d91ffcb2dca75e725b438182e3ff
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing lure. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing links to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6632

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://crysiq.ru/uplcv?utm_term=education+books+free+download+pdf PDF link annotation
    • http://ubest.ru/images/file/nusotug.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/zubatefajokorero.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f52734b9---wimututatudesosenovup.pdfIn PDF document text
    • http://levotst.com/uploads/files/negamekif.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/71676694250.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/70561504226.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/97784089093.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210903092343.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/10597716918.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b082bbb7b---81574158125.pdfIn PDF document text
    • http://chayka-svg.ru/files/74513771229.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/94972876477.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xokibadapodusub.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/fudoriwiv.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/resubodoboxos.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/7453390279.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/nokibeguziti.pdfIn PDF document text
    • http://jonellchem.com/upload/files/wuxupavupibodijisufaxokaj.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/femobofepowevo.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210912_102531.pdfPDF link annotation
    • https://salwangurugram.com/files/12789093303.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/xosazituv.pdfIn PDF document text
    • https://luminex.pl/upload/file/suxen.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/75310418920.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/9183679690.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11016 bytes
SHA-256: 2bd9d15814a7ca7483927918f6564ca2aebc8dc15f054373449e4eab982d58a1