Malicious PDF — malware analysis report

Static analysis result for SHA-256 65374ff28463c7a6…

MALICIOUS

PDF

131.2 KB Created: 2021-03-30 13:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7ff2b83850f19df797abad01e68c5dae SHA-1: 10189e290536debfae1249e8782e67ada360ad4d SHA-256: 65374ff28463c7a6c45aa47b2fc96382483c3e8ae2d71342b89fb319c73084fe
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to notifications, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/award?keyword=bssc+notification+2020+pdf PDF link annotation
    • https://budovabi.weebly.com/uploads/1/3/4/5/134510119/pizanuri.pdfIn PDF document text
    • http://hangzhoumetal.ru/death_star_plansiwdbo.pdfIn PDF document text
    • http://uscovidcharts.com/tekken_7_eliza_codeaigde.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/86c97fa7.pdfIn PDF document text
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/b958aa06.pdfIn PDF document text
    • http://laithub.pro/41461253238bilh0.pdfIn PDF document text
    • http://domavera.ru/how_to_increase_tesla_battery_rangeja3fz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_dc2d6daafb4c4007895d48833f6d237e.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_93a566083a2a44adb33b7fdbceff8283.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_6834ad2393574461a965e8a7eed5f660.pdf?index=trueIn PDF document text
    • http://xuzexotunel.epizy.com/31242320644.pdfIn PDF document text
    • http://xamorapex.epizy.com/dipawijamux.pdfIn PDF document text
    • http://votofeki.epizy.com/ipcc_auditing_standards_notes.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/anthropological_theories_upsc.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_3e3466bfada7403e840bbc2b678e8e57.pdf?index=trueIn PDF document text
    • http://lokatetaf.rf.gd/bevel_gear_calculation_formula.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_77476d62e96b4a8fb4947278668e8627.pdf?index=trueIn PDF document text
    • http://vawojemi.epizy.com/blank_piece_of_paper.pdfIn PDF document text
    • http://tasokapivodi.epizy.com/bfa_heirloom_enchanting_guide.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001899e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899E 5344 bytes
SHA-256: 959fa14ef26102e4eb0f3815838adfbf2a372753119a7d82b7e5232a4436afdf
font_01_sfnt_off00019be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE2 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001a745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A745 10496 bytes
SHA-256: 7cb0479af998f68961b50ef31a64305b016b0cf9b5c909cca662658a64acb519
font_03_sfnt_off0001cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB43 17412 bytes
SHA-256: bb301466a5df1aa8a0ec1cab474741ab7046f92512c75363b0efd131414eef25