Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f41b420a1368bed…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 22:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1ec5a7e6d59b88710385c598c6b4bcf SHA-1: 89248e6516a915dad13d89699384478634bd86b9 SHA-256: 9f41b420a1368bed1130f6c7db1e9d483c9e4a9b3ed6206eb86280ccd1580bcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various unknown domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://irastuff.com/admin/ckfinder/uploads/files/13553841661.pdf In PDF document text
    • http://travelcenterpuntos.com/campannas/file/54732536940.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/bakuva.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/pewoladelajuw.pdfIn PDF document text
    • http://herve-coiffure.ci/files/26629402997.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/57304258173.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/20257098069.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/62580300310.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sujululeganiwovoneroje.pdfIn PDF document text
    • http://fitviewer.de/files/file/tupuvibipozedisatogavig.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/82779456574.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7e13e1fe4---kavasijomurolat.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/nujadaputipadanovadase.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/midevexosimaroxodit.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/92537690870.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nepufolajivikor.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/fuwevonabelenimimojigaro.pdfIn PDF document text
    • http://vodova51-53.cz/files/9709769649.pdfIn PDF document text
    • https://kaparatt.com/images/File/86110489039.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/98997589659.pdfIn PDF document text
    • http://maxbrio.kr/files/files/95562053963.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/439676075.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/matujelame.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/52462198232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=friends+season+10+watch+onlinePDF 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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 17872 bytes
SHA-256: ad605459a3000d1b7375aeff4ac153f54fa95d62e419cf759e202a8f74491cab
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10704 bytes
SHA-256: 88645b6f2406161ed8cf1572faf81a56c89de929be14e0f5ed245b51d93346ad