Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d21ed7f5f289ce3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 20:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0899abe62e3ed3f7e5cfe1410c28e417 SHA-1: 92e7e219cc4c17e725438fc394240e49345af96d SHA-256: 4d21ed7f5f289ce35592f6a52cc3810598681733db03fce5f125474a054078dd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document by presenting it as tax-related information. The primary function appears to be directing users to a link farm for potential phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=what+is+12b+on+1040 PDF link annotation
    • http://makoxiniponino.iblogger.org/hamlet_oxford_bookworms_stage_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/dRFijgg/grandparent_gifts_for_baby.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/gdKPAjf/board_games_lite.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/6037278.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/247gdlE/gijusobuko.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/2970835.pdfIn PDF document text
    • http://vifepixakusuped.iblogger.org/python_programming_for_beginners_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/lAicqkc/21558616189.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/utjgqFZ/cute_wallpapers_vsco_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/aV4jijd/toilet_runs_every_5_min.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/1jcvOi2/school_management_system_with_php_open_source_project.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/jfUhkgg/5312384712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_2ae390adf08040a0a6830da945ead34f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e80c074-e486-41d5-b179-c71e874b5f8d/which_dish_is_best.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_f483c0ba9da84b3eb599c2000262d990.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0fd28d-c46a-4d7b-832d-c3e24d09426a/61720141009.pdfIn PDF document text
    • http://bomajada.epizy.com/cds_2_2020_question_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60cffce7-a510-4719-ac95-4f61c18e01a6/iso_31000_risk_management_and_risk_assessment_framework.pdfIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_a86a93d2c012416391cf1419e830a590.pdf?index=trueIn PDF document text
    • http://rexawisoza.epizy.com/cinestyle_canon_t3i.pdfIn PDF document text
    • http://konapawejiwevin.epizy.com/adobe_after_effect_cs4_kuyhaa.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_66be3598a50a4ae7973c4472cf587bc6.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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5212 bytes
SHA-256: ea02a97fafcc6323b5749045a14d0504c94d4ae40761e005789775ad0b5b7c95
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 10632 bytes
SHA-256: 8afaaa6e4f80df203b65c46d305a7784566e1f3809bd559fea037654f541b336