Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51c7ea40182cb15…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d6e14062ea32cb9068cbed0065fc102 SHA-1: 5a3c391522d535770319db860f89fb9379f7bd68 SHA-256: d51c7ea40182cb15475a5dcbdde358b0e236e6775136472199072d9aefbab04d
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 0.9997

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 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://jacksth.ru/123?utm_term=brca+gene+testing+guidelines PDF link annotation
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/zamowovimopagufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_601cb8f2f0fc8.pdfIn PDF document text
    • https://xuxefaposil.weebly.com/uploads/1/3/4/3/134393683/ebb2c3c9de5715.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/hiic2hj/reluvusowi.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/lK1jijb/assassin_s_creed_identity_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/AhbZYhb/download_aplikasi_zarchiver_pro_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fd5f2f3586b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_602a78b81b03d.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/xhhVii7/68041689808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5ffc63390999a.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/Vjf5fie/60253096117.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/zeOhdjB/11639229549.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/HnidigM/kopexefejamewonekitapex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462344/normal_5fe257f8a8256.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/7b4d4542e.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/ce75bb1b17e891b.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ijGmIjj/coin_hunter_game_app.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/8919318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_9732a11c82104b1a9e4476edd82e293d.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_4081482377c24a03b033cd6cb4ff83e4.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_30e3096bef6a415cab5e9cce52c2f00c.pdf?index=trueIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_46b5af276c3f4fecaaf0299664a0023d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 5156 bytes
SHA-256: 4cac496d4897d03f4b35201c3be2a3e2a8db6f588edc7640778d19350c169559
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 11184 bytes
SHA-256: 6b9c5c011085bcaf407b0ca0651a5b599d7f6ff234368be3add5cbfd3a12f9a1