Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a268ac9da5b96b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 23:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b803b2c7e1b9115b69e3c809685f1487 SHA-1: e21b000c270a37c7ed32c3c402437115c3098a58 SHA-256: a2a268ac9da5b96b670db1507d403f815707a1233b2650dd8670c403c5647422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this file as malicious. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=android+device+driver PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2skmo8jc0rl4scjinktqht6e96/loperalazadire.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/25600012180.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/78459692035.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/limabegozorefuzepipaxetu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/4855786191.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gobavepibusa.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/41791926881.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/77287471320.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kumelejonudogigom.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/26714156717.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/46629241620.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zenanuwu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///81635809540.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/90279308710.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/vevezizelanimo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bda00be7d---86250305819.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/99871616155.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/17146510125.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/71993871833.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/64089289108.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 9936 bytes
SHA-256: 5fccc033724d0245dd5b8c696f52eaf45d289f93cb5de7f2fb349c5c7f87ec0f
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 17764 bytes
SHA-256: f408f30768e290b1e747d495fe60f1707c0354424026c16375b5e8b4f92c8742

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