Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e5b400eef29b06…

MALICIOUS

PDF

83.3 KB Created: 2021-05-05 20:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49c86578151fc8d766d99809f43af705 SHA-1: 11cd4cecdfc84b39152c37c858676c8c49065536 SHA-256: 25e5b400eef29b0600c23b5725f15ccdf3c584e40f0f453bb174905da113fbc0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=does+costco+carry+luggage PDF link annotation
    • https://cdn.sqhk.co/bexefoboxevi/biX8AVP/42135272660.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/oStsZQc/61987434129.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ithchfP/infected_cut_on_foot.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/1040283603.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jhaG3gf/xufow.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/ihGnhah/vogozov.pdfIn PDF document text
    • http://danoguvu.medianewsonline.com/additional_mathematics_pure_and_applied_talbert_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_8497ca9a1bd24c2c8b47aad2cad1e67b.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_804bfd7633884563a58eb87be0b9f302.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_0cc042ceda084082a69bd91dddc5be8a.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_e2d8c113f726444a966de8884088d5b4.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_7ebce7b3a404476aa3c1015a188faa90.pdf?index=trueIn PDF document text
    • http://zumaruzafomadik.rf.gd/celerio_car_image.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_4c54084934844057bc0218cc9cebd80d.pdf?index=trueIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/sojadopavofoxevizope.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_86aa08b0f3ac493aa06f86a5bf088541.pdf?index=trueIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_cbb864d250c140f5ba2535001e62755a.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_4a50d9a914cd4a1da04845d7518c73ed.pdf?index=trueIn PDF document text
    • http://zelodigub.rf.gd/macbook_pro_2020_user_guide.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/garuvo.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_d6fc023a9cc44aeab49de478a2cc7cf8.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_d4ba7af0a6a34f9380b527e6ae15d956.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000124d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124D7 17628 bytes
SHA-256: c143a705e2d2483660a07792a36e8aa63de2127c7363b7e3d6b1f44fc759bfdd
font_00_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5068 bytes
SHA-256: 57a71b4b1bbb17255e5e377966a8c2641447bfd6173abc5d729766edb348b681
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10228 bytes
SHA-256: 1f13ead613b73cecf0bb817b1fefe5e98cbad9b6209562308d1205ecdbaf1e1a

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