Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3af317b6ea375a…

MALICIOUS

PDF

87.3 KB Created: 2021-05-09 15:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c427c40f9c72b00683f8bfbea7bff56 SHA-1: d9eda4d3b2933c965f8166980fd90b562b00135b SHA-256: 8d3af317b6ea375a3329594d4b3440d92037412ddf86fad5038056ad6b3704c8
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=triumph+bonneville+repair+manual+pdf PDF link annotation
    • http://janizejekifajab.medianewsonline.com/37859437564.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/5_axis_cnc_machine.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/weninegox.pdfIn PDF document text
    • http://prizinsta365.website/fonuwekabejokoj4b.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/download_kitab_maulid_barzanji.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/domosu.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/48783998518.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/fisemunotefojunofi.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/27904901475.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/sql_server_analytic_functions.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/pavabu.pdfIn PDF document text
    • http://casserlabs.xyz/71143860957oeo7a.pdfIn PDF document text
    • http://bestcreditcheck.info/amendolara_formaggi_piacenza5dltj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a439cdc4-ed91-4818-8274-4c3f48f5c1d1/francine_prose_reading_like_a_writer_sparknotes.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_f5d4f0df324c41828b6b3e0ebe49e2b6.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_7fba3b9deb414af5b771eeeda638252c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c644b5-5d05-4ede-aafd-65f7b028265c/sepexiwajowerepis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ba279c-f046-46a5-a57c-79dbf255b8b6/engineering_mathematics_stroud_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b859df-7ec1-4285-92f8-7f2e63495b09/14058811494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf51162-54ad-419c-a7e6-f3b3ce63f0c3/canon_pixma_mg3500_printer_manual.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_6b0a32745ada43bc93011440856e9d61.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5056 bytes
SHA-256: 453e5834b48be4e3b5bdd1f7d1e19eb073dbcf74e88ee1f69c56d1b8cf742a98
font_01_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 10208 bytes
SHA-256: 494a0cb8ce265b91e6826c3df1f8b444d6749eef03a156af84081892322bd6e0
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd
font_03_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2