Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baafa65426066d5…

MALICIOUS

PDF

89.7 KB Created: 2021-02-28 13:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74dccab9a06c3071feb3d906f38c8b26 SHA-1: 71b1fa170ee329eea2583e5e168688491e0f83f4 SHA-256: 4baafa65426066d5d117f778fda19aee1b8ba10e8ddbf75387ae5f19dfc1f864
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

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://pelibifir.ru/strik?utm_term=worx+wg309+8+amp+10-inch+corded+electric+pole+saw PDF link annotation
    • http://reduslim-italy.site/febakokimit22l9w.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/dosgcjP/96598707920.pdfIn PDF document text
    • http://retamos.mygamesonline.org/kotor_walkthrough_tatooine.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/ingenuity_bouncer_chair_weight_limit.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/bafuked-bigopa-pilisodibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5feb09f4b7ac8.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/11327078973.pdfIn PDF document text
    • http://limons.space/einstein_bagels_calorie_informationf4za5.pdfIn PDF document text
    • http://goossyy.online/parakeet_petco_near_me_open_nowjyjlo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_601ad420d8256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/google_translate_camera_online_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/the_courts_of_heaven.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/chemistry_material_safety_data_sheet_for_acetone.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/ayat_kursi_full_version.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/puwobum.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/a_lesson_before_dying_chapter_5_and_6_summary.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_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 6400 bytes
SHA-256: 48c2b071d9f0fe7cf9b1ab614171a8dd59a400c405c2cc60c24d1192fcf4d7c3
font_01_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 10868 bytes
SHA-256: d8afbeac7e52770df0987916573ada39ae7203815fde0b2f452a35297571fa9d

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