Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a899bf572ac3e7…

MALICIOUS

PDF

59.6 KB Created: 2021-09-25 00:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9b085b81edd2ec55a2b7d5ccd24ab77 SHA-1: e0d1781e7a2310fb0b328a0c42f66125ce16f99d SHA-256: 02a899bf572ac3e7e0a42e262eab301fd0205f2bc35fd84852feb346901c7fab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade initial security scans. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure suggests a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=norton+anthology+of+western+music+ebook PDF link annotation
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/74162632528.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/9777032323.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/67795222418.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/boxosolibuka.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a295e9b9d---87781482932.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/kinimesajib.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/97445906599.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/zepepazipaba.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/faxifo.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/95593198035.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/bajegor.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/bogofi.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/ruwufizirofegiluwafofa.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/76090955994.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917105214670.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95c015fe---62546650490.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/59800032832.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/33142398092.pdfIn PDF document text
    • http://isgsrl.it/images/file/sixov.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/sumusipajuvukinube.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/32776907851.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/sijanenujalo.pdfIn PDF document text
    • https://airshow-bg.com/file/35438206529.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_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 11292 bytes
SHA-256: d43e239843b57e9035e6c38201a189587f06cf80c9779b99deaf5b3c9ba65bf3

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