Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25d74f1772c2ded…

MALICIOUS

PDF

85.6 KB Created: 2021-03-25 08:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d980ff79b702827dd29b837f2d89055 SHA-1: 91c0a399409d1bd1e42bef61365f71ae42ec11f3 SHA-256: c25d74f1772c2dedb9b7d8a50a3005b24ab8459f9458e98aec4b73ba4e22a0d9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://dafemum.ru/strik?utm_term=subject+and+predicate+worksheet+pdf+grade+3' as malicious. The presence of numerous links suggests an attempt to distribute malware or conduct phishing by directing users to external, potentially harmful, sites.

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=subject+and+predicate+worksheet+pdf+grade+3 In PDF document text
    • https://cdn.sqhk.co/totafeta/ggjkhan/bajukowixuwafafikovixu.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/DBiivjd/all_fortnite_girl_skins_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/MRgegjq/supakotumadapoziviwimet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_89f254ca7e334f9192383286c0c991c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b90542-03bf-462d-b99b-28123e92926b/the_blind_side_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc3431b-51ef-4dc5-9eb6-fcfcc3c51447/they_say_i_say_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3f533e-1b3a-4908-8d7a-1078662c8152/demokuweroluduxifekor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488bbfc3-e760-4567-ae47-689480766b7c/is_there_an_amelia_bedelia_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122a6832-ead9-48e9-892e-b768b2146404/56369850317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab459fd-d0d5-4dd5-afbe-95b28b75db10/34927258350.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_934dfc6cf83c4a2b828c544b37d7280e.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_f392576c88274e42952e0935eed8b99f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84c691f-7e1d-4ffd-ad58-efaf099cb02d/xibig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033db3d6-354b-47db-adb0-fc47e8f35df9/why_we_crave_horror_movies_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138d8292-fd5f-4073-a295-a84f3aed4d89/85995916868.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_24eec3ef15c44ccebe5bb6e59c3c8e8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8d58e5-9ccf-41e3-b99b-f15e8ab040b1/bijumupimufon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973165ae-a4a7-4e84-8b1b-e353e20639e1/how_to_see_mt_fuji_from_osaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd15105-5919-4922-add9-5e7781377b6f/seiko_chronograph_100m_watch_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa0c58f-a453-44a3-a582-58e80f594d19/72613951274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa1206c-42a2-4c57-9f77-79e267027fa9/cfa_level_1_exam_paper_pattern.pdfIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_bcbe5ee6647941d68e15be928f6ed5d9.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 6024 bytes
SHA-256: fcf365b7d33fd866ed3c9b7e7caf4f51895ac6a26e3be4afd0cfdc053b3e9e8a
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 11248 bytes
SHA-256: ca794ecd9bc6b23d8ebcd82efca929826a08d9ef9742c8f0730537edf5f8a903