Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd12e6ea6484d37…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61a60d18ae78ad1a066b2c20c72e4600 SHA-1: ea73af49d0e28294e3104d2398130fb395ab2e64 SHA-256: 8fd12e6ea6484d37757dd3c5053b31b5a6b56b73566b5446d4a102a18f40c50a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document employs social engineering tactics, specifically a 'Browser extension / update installation lure', to trick users into downloading potentially malicious content. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lozipotod.ru/123?utm_term=cloudformation+template+reference PDF link annotation
    • http://fidofawi.medianewsonline.com/xa_trang_trong_bng_foxit_reader.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/interview_questions_on_data_structures_in_c.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/lufosugufo-razozupavemifig-bidukuge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5ff03366e173e.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/peninob.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/zuzopulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fcdb62b852c2.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/nisubotijap.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/moboxeb-ranove-pefowaja-fumux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc87b69cfe9b.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/romolebuzakofemabuxubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_3a98d9ececdd47bbb8cf1741775bb152.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/78879200314.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/49593175482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a597de01-38fc-42c1-b504-f40c9c4676fc/free_short_film_scripts_for_students_in_hindi.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/bukiziriwizokutamorewa.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/jometenelom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38186c20-4349-405c-a5ad-7dbf88bb18db/1920778416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60c2032-59e1-4dad-897c-a792e3b3c644/28758773751.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/composition_and_inverses_of_functions_worksheet_answers.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_f149662871e14e318a5ba31590c97e6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab28583-540e-405a-8acf-78a1e9251955/tipowegixizapozafenefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3260c9b7-c290-4ec5-a7aa-60f287f091af/what_are_dachshunds_descended_from.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/woods_timer_switch_50011_instructions.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_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 5028 bytes
SHA-256: 35361965fb18af27f2c4a1771532afcec4b4514c8dc6a851e88fd7b8bed1870b
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 11256 bytes
SHA-256: 67da13393176fd9b88332a6279ee6e37594501b8605cf2796deff17344cf98e9