Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f77b6824f62b543…

MALICIOUS

PDF

74.2 KB Created: 2021-03-08 00:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 187b1629206a40ae3f31578b5c63ff9e SHA-1: 73d264d5afe78c2cc640505a5adb78bde545f5a1 SHA-256: 4f77b6824f62b543f322fc31f8c868b0825468416e84a3edd97e74be0e187b0f
126 Risk Score

Malware Insights

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

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

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://vilenefex.ru/award?keyword=what+are+the+different+shots+in+film PDF link annotation
    • http://fashion-deals.xyz/derifugobop53gwc.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/mp3_murottal_30_juz_free_download.pdfIn PDF document text
    • http://zoompol.xyz/tidedudozalaj6pflv.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/hejaWi3/ikea_dresser_hemnes_white.pdfIn PDF document text
    • http://italysummer.space/pexorugaxpil8m.pdfIn PDF document text
    • http://samelike.site/bash_script_input_from_files2spy.pdfIn PDF document text
    • http://ecosbor.net/amazon_books_the_jane_austen_societypex5s.pdfIn PDF document text
    • http://b4shop.icu/994158183029mbwb.pdfIn PDF document text
    • http://maska-respirator.shop/types_of_sentence_structure_worksheetsq6egj.pdfIn PDF document text
    • https://cdn.sqhk.co/suwenadikum/ajdjiQB/31371801342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebad76d-e3c5-4a55-bcf3-bf6fcccc1b3f/sibejawusakazebedufopodi.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/bissell_poweredge_pet_hard_floor_vacuum_filter.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_daf39caa37664281b7e37b4b82cc4d03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3a6d38-6ab4-438a-bb32-68d0501bf059/inkscape_clip_to_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6358c009-1b14-4779-88df-7eb0c4ecb456/wupatemovawikon.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_475998b1560848a98a651f0e1e4327fd.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_51141ca398f34a57b752e4d1fd56aabf.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_d5076fef69764011a9a4d89eae93c72f.pdf?index=trueIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/zoom_cable_modem_5350_manual.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_e2fe2a1950d64345a15fdd6377f79184.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_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 5160 bytes
SHA-256: 9ac98ab2d679c9dd5b47c068454fdb3f995b5bca274badc7c207ec672b0c18fa
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10032 bytes
SHA-256: 81255101ae53a749fae79d5f9dc6a995a0cf2355d318e42168e34778b0207168

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