Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03ac1c487859d47…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 22:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ca72f95af6a93f4be8650d1cb7832b2 SHA-1: 1dc3bf85dfdc79b85ecf990ad21245bf9129af33 SHA-256: b03ac1c487859d4788dd223340aedeb95a624364d0f95873f1005d7d5129fd4c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, with one directly pointing to an IP address, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains. While no scripts were explicitly extracted, the presence of PDF URIs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=pokemon+light+platinum+gba+cheat+codes PDF link annotation
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/31083022971.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/gubatonemudat.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/rilenalupupobeluwurun.pdfPDF link annotation
    • http://goldmustang.com/files/files/funudurujina.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/43953228925.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/73811640049.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae1dccd741---jetavinufed.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/sejogufasebupob.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/maluvutatu.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/79075302495.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/51348222389.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lojupe.pdfIn PDF document text
    • https://nls.vn/upload/files/xejafajapilezibowudujar.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64571252650.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/mivipavaxudotitukexuvirin.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/mobetipisojomewoji.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/dijej.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/vixanizugasokubin.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/1187087382.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/92071938818.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/84981962786.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131473d3c6ae---41084394050.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_off0000b13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 17024 bytes
SHA-256: 659db24ec7c80b9dea56994ff09f8d3e4281ab4f587e5aaa2436391144201725
font_02_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 11196 bytes
SHA-256: 645cc07a5cf7cf418536e8683119da4fb16b8e1b7c2c75b358ad70e3516e60d5