Malicious PDF — malware analysis report

Static analysis result for SHA-256 c753bbaa66d604b1…

MALICIOUS

PDF

75.3 KB Created: 2021-06-09 15:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9b29fd2b7886edfd1403a49e71fc1b1 SHA-1: 03fb44a7d6e2ce2e9f236f3d10c26bd59b2231c1 SHA-256: c753bbaa66d604b1fb31f7a2d7e23e995fbb9900d2af4533210b3bde0afd9fc8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to link farms and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'best android ringtones mp3 download', which may be part of a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/pbw?utm_term=best+android+ringtones+mp3+download PDF link annotation
    • https://kuzirorox.weebly.com/uploads/1/3/0/7/130775715/mifowojapajerotovuf.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/6557515.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/723ca978.pdfIn PDF document text
    • https://poxixarusel.weebly.com/uploads/1/3/4/1/134131789/lijazavixabiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416823/22992711737.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144422346/google_dialer_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06856d1-8724-41b3-a430-d35ef05c67bb/shakes_to_lose_belly_fat_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a68b36-157f-4e8c-ac0c-bca2d723c6aa/dungeons_and_dragons_5e_download.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/frozen_fever_full_movie_download_with_english_subtitles.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/67154824549.pdfIn PDF document text
    • http://farejutotej.pbworks.com/w/file/fetch/144798975/how_to_write_a_cover_letter_for_a_phd_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7dc7a8-b5a7-4d92-bb02-75a23985d801/54404587106.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/ouk_oyunu_indir_bedava.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144916959/spanish_gospel_songs_free_download.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/w/file/fetch/144755478/science_worksheets_for_kindergarten.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/w/file/fetch/144628494/download_super_mario_bros_64_rom_hack.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/filme_50_tons_de_liberdade_google_docs.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144533391/air_mass_worksheet_answer_key.pdfIn PDF document text
    • http://newubotadov.pbworks.com/w/file/fetch/144952629/71015450756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7225f381-22b0-4543-ab86-d63d45c130b5/57694080156.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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 5584 bytes
SHA-256: cce0d92810a20bb5ba36c5c761fb08e7657bb99b2601d141072ca1364d90a0e4
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10356 bytes
SHA-256: e1cfc53ab66901a05c7a843cedc78e6d0f53c52333c2f938c153ae1f61aea8df

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