Malicious PDF — malware analysis report

Static analysis result for SHA-256 0039819aabdc8213…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 02:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f465661f87b5abab84b990839aadc980 SHA-1: cd562e00a38432cc08400b81e8acfb36ef3793dc SHA-256: 0039819aabdc8213f70e9c2d97d615750d7f7edf657fd6cade16667593645daf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains and IP addresses, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic further supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • 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://archism.ru/uplcv?utm_term=resident+evil+4+for+android+game+download PDF link annotation
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/92659582063.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/30810055404.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/20811960423.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/bupilofupedifimi.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/noropowu.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/pewexonugopupusunoruta.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/litiwafagojadonofa.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/14193640555.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/rasafabexememuvitisavusa.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/89839221684.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee12dff99---56392418328.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/faxukerege.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b89e428aa---duzixofodej.pdfIn PDF document text
    • http://poorclarescork.ie/images/rawubawumugomozagubuzago.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/diloviwabef.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/66640676520.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/domesumaguf.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/kawewexekujimipusovut.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f481792438---gemulipurukivokija.pdfPDF link annotation
    • https://travellifeafrica.com/ci/userfiles/files/newutebifewasuwagotiv.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/66752389066.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/79327733537.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dunajijawalabafaxoruzox.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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 16936 bytes
SHA-256: 0629f3a2453916dbe417ea88a60102a706a3bd00f8bf8101491386ce9317453b
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 10972 bytes
SHA-256: 9ffd7e2f5ac293eac79b2aaaa75cfe26214641862b9b4c014c2b9739aaddb7f7