Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf26820f1e03171…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 18:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a20d73378d6b8cc5c7c8e1b75925b35 SHA-1: f577340cb8432144fc007298e389cd96cc7f8440 SHA-256: 0bf26820f1e031717d14c486060c68bb6645a4c878898049a1394d2e2446d8af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a link farm detector and a machine learning classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to unknown or suspicious domains, further supports this assessment. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://feuerwehrobrigheim.de/upload/files/valega.pdf In PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jedijevokefape.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/fapofesolaxenol.pdfIn PDF document text
    • http://pb-book.com/user_file/file/39929010018.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jesd04c4b1q1p93c10frb4o23t/lozimazarowezufisodabixat.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/xokiraritudalinij.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/nanoxeros.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/segojobefopig.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/68108754455.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/togexixiniwava.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tomulubul.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363e6419203---sifokubezibikasibopemof.pdfIn PDF document text
    • http://farashimirooz.com/files/20939370417.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/92751377985.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905043159.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/wozelexowamexebiboxiwevef.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/dubakuxidokazijosugevu.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/61940554738.pdfIn PDF document text
    • http://citranco.com/users/files/lofogefu.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/12164176844.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/tupodotokemabemolad.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/xinubujanejalirupoluzusa.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/pobunewaj.pdfIn PDF document text
    • http://caythuocnam.org/images/files/litikobutekud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ssc+ldc+syllabus+2019+pdf+downloadPDF 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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 18376 bytes
SHA-256: 172f74c8b26773c6cdca4a5ba91ec496276f838c9cf485d8adc4f91a0d909821
font_01_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 11168 bytes
SHA-256: 85dcb3f2f5749e05bba45a72fa2e7b0c54f390b683d60394dcf720c44bbef83a