Malicious PDF — malware analysis report

Static analysis result for SHA-256 0792840f9bad8ce2…

MALICIOUS

PDF

79.2 KB Created: 2021-04-17 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ed8275e7f5ec836a5ac164db7353432 SHA-1: 6ac52e34019cb7af08c7482989591d55f6baeb86 SHA-256: 0792840f9bad8ce25b978faca088062fa0b51e37a98929f521b93c6f93ca7eca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=bks+iyengar+light+on+yoga+quotes
    • http://pazadixokumox.sportsontheweb.net/bearing_designation_skf.pdf
    • http://balewezekowesab.iblogger.org/internship_interview_questions_and_answers.pdf
    • http://kijekidajefi.getenjoyment.net/sigma_aldrich_catalogo.pdf
    • http://fodibuj.scienceontheweb.net/maxubirevo.pdf
    • http://mozobadijoba.medianewsonline.com/81399907121.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://piterar.epizy.com/over_the_rainbow_piano_sheet_music_harold_arlen.pdf
    • https://s3.amazonaws.com/jevopemosod/fatobubigonanimijuzixa.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_f5dc390247244e12a98e50e97094cae8.pdf?index=true
    • http://buzidasore.rf.gd/the_accidental_administrator_cisco_router_step-by-step_configuration_guide_free_download.pdf
    • http://kutijizon.epizy.com/83759074593.pdf
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_412e6cd5ec844277963f2ec654e6680f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64908a33-fb7b-45d7-829e-2cf9e0eb2fba/62486395972.pdf
    • https://s3.amazonaws.com/gekixadonuru/rafodotufujadepaxu.pdf
    • https://uploads.strikinglycdn.com/files/f9e79f4f-179b-41d2-b9be-c55afe5b4473/what_kind_of_battery_does_my_nissan_key_fob_take.pdf
    • https://s3.amazonaws.com/dowesitobuga/the_greatest_miracle_in_the_world.pdf
    • https://s3.amazonaws.com/gupojakami/25997102701.pdf
    • http://mawidinivetobi.myartsonline.com/error_code_0x-1ffffdb9.pdf
    • https://uploads.strikinglycdn.com/files/a7148598-d55b-44df-b1f9-8b9f43556be9/attack_on_titan_wallpaper_iphone.pdf
    • https://s3.amazonaws.com/tufitijinexu/basilica_benedettina_sant_angelo_in_formis_matrimonio.pdf
    • https://uploads.strikinglycdn.com/files/5a55c091-4874-40e4-a6a9-4dd368dcd059/xodirapupiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8aa.bin
974967cc5a27584a927e67f49261786f75c44b94a27ab5d1c8ba478b7a45e0c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 5288 bytes
font_01_sfnt_off00010aaf.bin
c6592cb6fd11ada1d751458034c0d0ba5a5428ce76547188dc8042358afdedd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10976 bytes

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