Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f2418cf425d89…

MALICIOUS

PDF

68.9 KB Created: 2021-05-15 05:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 539a3bb08731f85d0685a56c15bd7248 SHA-1: 58dfebd49a3ebaaf21368301da41403475cc0890 SHA-256: a85f2418cf425d896b7447f0d4a925c5d6b3abaf0bf63cec093ef571892b9138
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 0.9993

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://crophysi.ru/strik?utm_term=beautiful+creatures+lyrics+max PDF link annotation
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/najim.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/61125311481.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/wokinevedametusa.pdfIn PDF document text
    • https://wipovatoz.weebly.com/uploads/1/3/4/0/134012317/zesojekawo_lozizakar.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/mujujoliwanix-filivut-vumojit-zagomazo.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/ximivaveduvu-dotozevave-bimamivonidad.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/44750735953.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/piggery_business_plan_south_africa.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/zilixewenezi.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/96064279048.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/capitals_and_currencies_of_all_countries.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8e18b9-c7c3-4044-a6d4-827be66489d3/27944116929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c724f5a-19a1-45fa-b91b-10c60d032374/linking_words_list_for_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d30bd7-2b8f-40d9-96b2-d6ab5086c82b/wotlk_lockpicking_guide_warmane_alliance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e70683-238c-4545-955e-3b1c4f2a6765/two_phase_simplex_method_examples.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_27a59fb16a5f48478f59060e0437bad8.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/antipsychotic_medication_list.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_493049d3387b40e3888c6a89baedb705.pdf?index=trueIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/british_admiralty_chart_symbols.pdfIn PDF document text
    • http://bigamutalunu.atwebpages.com/95373914920.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/wahl_clippers_not_working.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_08a23135cec541f386b75fd3c085b56a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/544be437-1528-4507-b107-387bce9b975b/divx_converter_10.8.7_serial_number.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 5244 bytes
SHA-256: 9756dbc5ae76936ec94b48137a3c05590d7a3567c32c91e2578434e0eeede7b6
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 9980 bytes
SHA-256: 649a18dda5692a80cb0d62637385cfa103ed57ee8b8c1adcf4f6d83e7f1a29b5