Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4a45a8c928b002…

MALICIOUS

PDF

83.9 KB Created: 2021-03-07 13:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fe55816f225b6d3a0cb87d345e4f7b40 SHA-1: f29b0afe4396d6100d01aab60b0210731dc5945b SHA-256: bb4a45a8c928b00215ea95557e94a55ee0c13cd801ab248cb6586c3438dd9872
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/strik?utm_term=physics+1+formula+sheet+college In PDF document text
    • http://segaruzobuguses.scienceontheweb.net/jumemiminadaxiz.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/34412281231f8q0b.pdfIn PDF document text
    • http://istlan.fun/996587532qag8.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/dezixisidamedolones.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/buwigofumogupo_kapij_wewadorumimivap.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/vixex-xivif-mavuwetamakidil-tulise.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/47629503045.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/4005657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4ace12cc-c7fa-4ed6-a470-3f0eed16472a/etymological_dictionary_of_proto-germanic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0880f5e7-639e-4b05-a9fe-7832b5f5633b/macmillan_mcgraw_hill_3rd_grade_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d594b3-d549-47e8-b1a1-727aa74807cc/25289370686.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_3a45dc5432864272b08c4449cefedeab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/744a6155-46ec-4ebf-b6a8-2bbfc0422fe6/price_of_hisense_tv_32_inch_in_ghana.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_809f1d16a9094723a7f117502215aa65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f70971d-9276-4c14-8fa5-11f78579fc50/does_my_pioneer_receiver_support_arc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15dab44-471f-4909-975a-ff17a37f2f16/garuda_puranam_full_book_in_telugu.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_0b1c13742cf6401a8e97ee543f581e78.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_e169e76ae26243d3905d4a54dab25bf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d38482-5ad0-4f90-aede-0e3bcd6b8277/tone_it_up_fitness_apparel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 5224 bytes
SHA-256: 6af58ae1067a02050a0ee245afb0c017d83553d7c999935e1b17c89d3cf56a98
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 10712 bytes
SHA-256: ff7800122ab31982002535eef8bfd53a38c4f002ba2a87678f87bec8e4145a35
font_02_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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