Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da71c4aeb54c651…

MALICIOUS

PDF

74.5 KB Created: 2021-03-09 05:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78644c29b71dc5234e8efacf2db6fa9a SHA-1: 8431fd232a762748734e92dbad5ccfe76846a6c9 SHA-256: 4da71c4aeb54c651ff50148e1f7d942e2d0a3101e9526ce7aa213d8c914d7a8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging a PDF exploit or social engineering.

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://pelibifir.ru/123?utm_term=antibiotics+guidelines+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403952/normal_603de2c17aa79.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/zupuzotuvaxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459027/normal_603977978caed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_603398d6da07d.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/soligusikirodeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_6009a9b4d8156.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/volume_of_a_cuboid_in_litres_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fca7e63a65cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fde4c9cd6d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_6019829f0039d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulorowanutabu.atwebpages.com/google_search_by_photo_upload.pdfIn PDF document text
    • http://kopolug.myartsonline.com/kenmore_refrigerator_ice_maker_not_working_no_water.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/zevenaxuzevatiliworekeruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056f411b-6026-4c3a-a4bb-b04d710b22f4/meaning_of_absence_of_quorum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f127c47a-05a3-4664-a9b8-8357acc4b9db/birubivenebozigisudadak.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/dell_optiplex_gx620_drivers_download_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b824cde-6d35-4592-ae5d-18bad146dadc/how_to_set_up_petsafe_wireless_containment_system.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/pivot_animator_free_for_windows_8.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/maus_spiegelman_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732fd2a3-e47e-40c6-a510-bf7bea6c71a2/fisher_paykel_dishwasher_repair_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/subudi.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5148 bytes
SHA-256: a4ccfaba6f31e5907494b76df7a51ec77ada044aac7515357eafd9ed5cf471fe
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 11208 bytes
SHA-256: bcc72fe959d1090c7b43a9882f5f34f4d71e04b6780555a4ad6a0dc8fefa1726

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