Malicious PDF — malware analysis report

Static analysis result for SHA-256 2285447f0765569a…

MALICIOUS

PDF

71.0 KB Created: 2021-04-01 04:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da86c2cd7cdab0231172232f09c83906 SHA-1: df313f75ddcf290314a7e3d9e7ab02daaa77dead SHA-256: 2285447f0765569a2ff7f7a466817088497a8860953d9a8cd7675323e804d7b1
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=but+how+do+it+know+pdf+download+free In PDF document text
    • http://lujuvudav.22web.org/arcsoft_totalmedia_3._5_deutsch.pdfIn PDF document text
    • http://kemytbok.xyz/3_circle_venn_diagram_word_problems_worksheetpwyzx.pdfIn PDF document text
    • http://parkji5x.xyz/feng_shui_roleplaying_gameuaxfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_6050daa63afb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_603ab0d94c1fc.pdfIn PDF document text
    • http://fepegabilufe.iblogger.org/64008442541.pdfIn PDF document text
    • http://zelolugo.22web.org/buliketeginuru.pdfIn PDF document text
    • http://rewita.fun/when_is_league_of_legends_patch37a0s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5fee8146b2376.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/eNifhbL/bouncy_ball_recipe_without_cornstarch.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/ThBjatr/mx_player_download_for_android_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_6040aa3835684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60560f41d3063.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/0gegf7d/7314284823.pdfIn PDF document text
    • https://cdn.sqhk.co/wenoxavawo/38Z4zty/smith_s_knife_sharpener_stone.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gfngijc/28755631965.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/auto_chess_apk_pczaisx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/niporofez/solving_quadratic_equations_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/avid_media_composer_8_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ac5b3a-20eb-4098-bf7f-9f606df6203d/chetan_bhagat_books_free_download_revolution_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/masterwork_battlemage_staff_grip_schematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e126254-b3eb-456e-81ea-76abbed2211b/digotodupenewabavawu.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/legexusakizefaraponodon.pdfIn PDF document text
    • http://rigexeleza.rf.gd/pavekizasew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 5040 bytes
SHA-256: 92f81869bad5ac57642b10a5bb5197992e8354a816afa5d6a1658e330b975647
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10128 bytes
SHA-256: dea43850ce3f655d1c484baf7afefa3484481c525f18b73d160f9819d792dd2b
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f