Malicious PDF — malware analysis report

Static analysis result for SHA-256 27906e3b614f22fb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e50eebe2f342d9a0c9f411492b2b5c5 SHA-1: db177b69e358c34d9ef430b84861ed2c102681c1 SHA-256: 27906e3b614f22fb4118e3fd825bf35d23510103ca3088ade7009dd5ecc276ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=www+bolly4u+movies+online PDF link annotation
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/37417603340.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/78879741971.pdfIn PDF document text
    • http://villkasz.hu/editor_up/72566596444.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/90823067702.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/92678362901.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/matelebipegozizukujo.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/85584705324.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/noluvobinusavi.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/jaravupobupabubosakoligi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/88627220969.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/465aba94524f88785a89e3d9437dd192/74373110675.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613f222c144b6---kilafuborulijido.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/95526720576.pdfIn PDF document text
    • http://kechengchem.com/upload/files/36773422772.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/ramiguno.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/bomuvekowuvosipasez.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/sixogilojizizaxuxo.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/49485519071.pdfIn PDF document text
    • http://gdgom.com/upload/file/210930192754158514ag8o9o826rb5.pdfIn PDF document text
    • http://uchid.com/uploads/file/zuteripemolawa.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/gugaxi.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/15035281681.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/72843046001.pdfIn PDF document text
    • http://koddous.com/userfiles/file/62586128438.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_off0000afcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 10488 bytes
SHA-256: ec627c96c0c244330d3ba8a37d66abac5e2c0539243e87c85ee3d325e3df63e4
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 16520 bytes
SHA-256: bd35ce1088781c028d0f6953db05dcebd44ace6df38b7f109cf9a81ec2449827

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