Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec36c75ec8bec043…

MALICIOUS

PDF

101.0 KB Created: 2021-02-11 18:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b0802fec9c0ef3e53ec34097ece5453 SHA-1: 1619043b2258e8c18d0817703924110425bbf09a SHA-256: ec36c75ec8bec043fa31b578f568917ac8c67341ac84f20990ec5cf5297762e9
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=la+fraternidad+de+eihwaz+descargar PDF link annotation
    • https://cdn.sqhk.co/daxegajok/XieKmic/kujubita.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/1hjZhe7/58863609408.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/4948e92dfc5.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/girot.pdfIn PDF document text
    • http://fikosigupim.22web.org/psilocybe_semilanceata_hunting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jjRhelm/25128530646.pdfIn PDF document text
    • http://dizanuvusawowi.22web.org/wuniribezav.pdfIn PDF document text
    • http://fragcups.com/best_uml_tutorialwoofo.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/kukisozaw-misojileduxuwer.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/tesutulegufuvazuz.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/somuzarur_rupor_fogenegajepeb.pdfIn PDF document text
    • http://xiwotafajiloluf.22web.org/jonopazarebagetolupoladix.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/9837792.pdfIn PDF document text
    • http://autokenn.com/91833144406coom3.pdfIn PDF document text
    • http://ifeelgood.club/mcdonalds_breakfast_menu_nutrition_informationq9ixi.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/hwjbRja/skulduggery_meaning_in_english_oxford.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ohe0Pib/fun_101_okey_arkadaslarla_oynama.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/15d83ba536a062a.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
    • http://kazigolukujo.epizy.com/nojopamewujinipixef.pdfIn PDF document text
    • http://titarugusarab.epizy.com/foxamexegerefeginusumita.pdfIn PDF document text
    • http://delozaroj.epizy.com/wiximofeguzera.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014c03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C03 24060 bytes
SHA-256: e5e5999f6ffe7085ba9461e51f11b24723dc88e7bac981d0bac9fc7af1cb49ad
font_00_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 5012 bytes
SHA-256: 393b45138d2665e9a3ebb7b49f213becd3bab6685a639cc05aec12cd10ff4ca4
font_01_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 12624 bytes
SHA-256: f53c9a6083b5d81388c8842d6f5ae87aa313ac75310a6e377acf8093fe8b37f1
font_03_sfnt_off000175fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e