Malicious PDF — malware analysis report

Static analysis result for SHA-256 529251b8098bd617…

MALICIOUS

PDF

75.6 KB Created: 2021-05-07 13:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0dc99b5a932c3f6421551fe8e7840abb SHA-1: 26ee578f95ae1b27f5da8809fb2b0b9839b56771 SHA-256: 529251b8098bd617ff6963ab5f54307cde370b081b0594c9f2b2182bc5eebe53
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or phishing infrastructure. The presence of a URL with a 'utm_term' parameter indicates a potential tracking or redirection mechanism designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=how+to+put+water+in+brita+water+bottle PDF link annotation
    • http://jitokinut.iblogger.org/fejunanasaperefijixivaded.pdfIn PDF document text
    • http://nakanilo.club/thimbleweed_park_ps4_reviewb1v2x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ffff43fe634f.pdfIn PDF document text
    • http://christinaanddavid2019.com/865997927709m8le.pdfIn PDF document text
    • http://pidoxabomekoju.iblogger.org/banderas_y_escudos_del_mundo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6011d985144a7.pdfIn PDF document text
    • http://ita-talia.fun/47812891618h2i83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_602064512c64c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb369032bd8.pdfIn PDF document text
    • http://kawlites.online/jugaxand14h.pdfIn PDF document text
    • http://indohealth365.online/gesema7tfno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_604111874a1e9.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/59fe30cf-7bf0-4493-9681-773bc29dc12f/best_graphic_novels_for_middle_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0fc06c-1170-4d13-ad44-1d17980f3437/11952783982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1797709e-6edd-407d-a79b-b4debb23d361/cnc_programming_handbook_third_edition_volume_1.pdfIn PDF document text
    • http://romigutik.epizy.com/mathematical_reasoning_questions_for_jee_mains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e85e050-9737-425d-a89a-3532deaefb49/the_road_to_wigan_pier_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4547c988-9a7b-4cf7-b1ca-0bb4213239e4/remote_codes_for_urc-8820-cisco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326090af-1e93-4e84-8698-f7072485dd9a/43838936219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c03315d-23b1-4218-b867-8033f334dcdb/audio_technica_system_10_pro_vs_shure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb39cfe2-b16c-41f3-b47a-76e8bdd92787/13840991913.pdfIn PDF document text
    • http://girifej.epizy.com/different_definitions_of_language.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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 4828 bytes
SHA-256: 8283c411429c5476981f3e59c2a506f5388560ed883c7815d1a5cb85bd75462e
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 10940 bytes
SHA-256: b4877e2ae4fa971f0850f943108e22be4e5a7d1c83affd4ee8c42c73740317dd