Malicious PDF — malware analysis report

Static analysis result for SHA-256 8befcf950078ea0f…

MALICIOUS

PDF

83.1 KB Created: 2021-04-11 15:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52b09bfbf77874c3944fb0b612cc40b7 SHA-1: 44a4aa1249cecf0e1f0ff64921f2c3a0a0c92310 SHA-256: 8befcf950078ea0f0182d321642df090aed6310a5b7c4afcfdece42175acc448
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=iatf+internal+auditor+training+ppt PDF link annotation
    • https://cdn.sqhk.co/jifonakilux/E9Wiakx/33744573696.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/puwivozov.pdfIn PDF document text
    • http://zepedewum.iblogger.org/zelexokisaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/ejmhdhj/vagevisijumu.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/Hjgahb2/bereavement_2011_full_movie.pdfIn PDF document text
    • http://kalides.22web.org/american_english_file_2_workbook_resuelto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_8c4bd1a497f846578caaf83ccd6adad6.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_d6f5824d6d204dabbaad82e966fbb76d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4d3daf-1eff-4d66-a737-8bcf69bb7123/zaloxobunabezi.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_35c704aa9b4649a29a32c7210db73936.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_8885794b25a74339bd724bd8ac04092e.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_353bc852424a4573811f0490075655bd.pdf?index=trueIn PDF document text
    • http://wokidomogu.onlinewebshop.net/the_very_hungry_caterpillar_food.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_d41ca94458e94b4cae64613bcbf2ea19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3552ed-dbb2-4788-8dcb-00718116cbc5/75538034533.pdfIn PDF document text
    • http://ruvibeli.rf.gd/bizanepabujitalosipi.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_dd8da08d04ea4a739eeafb819fdd2b35.pdf?index=trueIn PDF document text
    • http://zikifivetijunu.epizy.com/the_golden_rule_sewing_book.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_63315ef272814c9e80ed23cf45cdff9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/524ac75b-baef-4f16-ad88-d8e418585564/85177342540.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/bepukikibasokura.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_83e30bd0cc4342d29543588d587d024d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 4968 bytes
SHA-256: 9f1644e1d6572a51767156fc90566ee7a8aaab895cc7ed866dfe13990dcf88f7
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10880 bytes
SHA-256: 925ca55e46bda048eb8735940963180fc918686d76bfc8f856e343ea2a5fa39f
font_02_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 17304 bytes
SHA-256: 90a8e51f4ff956c9d430c84f844a883d9b7e8c82ccf7833822d2a23056056c2c