Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ad11a24d4aa95d…

MALICIOUS

PDF

73.0 KB Created: 2021-05-15 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1fd66b643772a170ed835bdf33e3a297 SHA-1: ec4766f4fbd4afdafb2b79f675f2f84c4bb523f1 SHA-256: f3ad11a24d4aa95d2d2a35c96493440ce51dd1f3744431851c5f675b198af15b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a redirection or download attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting the lure and distribution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=icharger+308+duo+vs+4010+duo PDF link annotation
    • http://beririka.scienceontheweb.net/how_many_books_of_fifty_shades_of_grey_are_there.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5feba9b136436.pdfIn PDF document text
    • http://derewopenila.22web.org/97553168714.pdfIn PDF document text
    • http://help-bluebadgecenter.com/pewewifasugjdzx1.pdfIn PDF document text
    • http://vvd.bar/vidiwaxawupikihuq.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/pepedajimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417526/normal_60087d2ec4efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_601471d5129fb.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/39d8810b96.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/an_introduction_to_parallel_programming_peter_pachecol9jay.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/american_english_file_2_test.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/7797828.pdfIn PDF document text
    • https://xikanunifozale.weebly.com/uploads/1/3/1/8/131860479/9148249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_601e67ee1019d.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/ec30cc9a-1309-49e3-ae0f-6b5288157ea5/how_to_renew_your_permit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fffcb9-13d5-443d-a653-b04a11015213/45806124365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c2296c-7369-4678-a5bd-4b264f84ad81/best_data_structures_and_algorithms_course_c.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/89133177426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0f1477-b489-4192-b9d2-5996022b9a15/bikatodon.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/manual_de_blender_2._79.pdfIn PDF document text
    • http://mubadel.epizy.com/storyboarding_for_animation.pdfIn PDF document text
    • http://fodiragotisaka.epizy.com/complete_java_tutorial_free_download.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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 5804 bytes
SHA-256: 30e4ccafa687e6629b2e465f88f90ee366b9630ad7ed3391df2f50d7562a4736
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 11152 bytes
SHA-256: 0c3205ce68cdf194a3765a2c4c74fdfd3d783f45989844827cea142824d0b0d7

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