Malicious PDF — malware analysis report

Static analysis result for SHA-256 3527f1cc2b778dee…

MALICIOUS

PDF

79.1 KB Created: 2021-05-31 09:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5f991d54a4d912ffdb14d3e65b776aac SHA-1: 1bf3cb57d1da871313f3c231488b9013b360cda6 SHA-256: 3527f1cc2b778dee85e12d4ac803e8f26e046879f0535c4c0ef4f515041de8ed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://midufefew.ru/123?utm_term=linear+heat+conduction+experiment+report PDF link annotation
    • https://fosisejabevenot.weebly.com/uploads/1/3/5/3/135398983/6840f6e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478951/normal_60aff8689e31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_60301fd30178b.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/fovisi.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/17aeb51be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600df795e9b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fd0a35a45d52.pdfIn PDF document text
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/91e06c.pdfIn PDF document text
    • https://ziwevanefenej.weebly.com/uploads/1/3/4/5/134591483/938c6af69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600e09028fcf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_5febd13b02bfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fcbf6ffeb1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_602c3b9aba153.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/7e73f802-5a6c-4ebf-85f5-b05c3bf28e89/vezuzaxubuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13402db9-d802-4f0e-b3a3-b98b10cf54f5/the_fall_of_the_house_of_usher_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa80d0b-738c-40e1-ac90-ea6de66ed3a5/mosbys_diagnostic_and_laboratory_test_reference_13th_edition_apa_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e545b4ab-f6f2-4886-99f2-f73477810582/61515295852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8830e5-2d51-4f4b-a5a9-b7a0390c4768/32761982088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66bac776-cf98-4507-bd3d-279a0732ec95/tazizisoxurepegedem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73cb0ba-32f5-4369-ac89-b5b91361c8a5/zidufesevojupowisover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3cdcfd-9a1f-439c-a25e-dc68812f7edf/quantitative_trading_with_r_georgakopoulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412571f9-8f9c-4f7f-bcee-98c6e47489e2/how_to_handle_stress_job_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8381860-d26e-48dd-9613-e2bcbb729bac/makodomuvanijirofenijunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3869a8f7-3ece-46e7-91a7-ca7c73b9329c/20104466697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd216cd-dad8-4b74-9490-74702ae3f894/tigekevuxabupisu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 6812 bytes
SHA-256: 4c01676872f2c72062a51d493329c74a182749ff22fed74958abff2512b0c5e5
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 5112 bytes
SHA-256: 1cc956d258d06f55ac6239ff126f0b4f530a65410ea19bc445baa695271c931f
font_02_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 10932 bytes
SHA-256: 1d2e303026fb6fdb3e3ebac0f522b36500f447abdac4ac01530eb9c3ace37555

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