Malicious PDF — malware analysis report

Static analysis result for SHA-256 11835925765917c4…

MALICIOUS

PDF

87.7 KB Created: 2021-03-15 12:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 25cbc680101dd3dd2eb4ea946a5dbb9d SHA-1: d0fea06a8c25a3e2e112fcf40b622abfd4ee4b0b SHA-256: 11835925765917c43eebae9d6a8371c12760c9015f99cb3bce472819f446db59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://leonvi.ru/123?utm_term=bitvise+ssh+client PDF link annotation
    • http://ragadugizidej.22web.org/35784288253.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/jdSjbje/king_empire_alto_saxophone_serial_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/hegggjK/38125472949.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/how_to_clean_an_enagic_leveluk_sd501.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/jehiTgd/ghostrunner_review_xbox.pdfIn PDF document text
    • https://dubelife.weebly.com/uploads/1/3/4/3/134379826/varewed_bupolim.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/kikudegedakilamaxugewifo.pdfIn PDF document text
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/2103614.pdfIn PDF document text
    • http://jezapaditasas.22web.org/conceptual_physics_reading_and_study_workbook_answers_chapter_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teluroluxeterez.myartsonline.com/how_to_register_protection_plan_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/dhakad_chora_2_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/soul_of_a_citizen_audiobook.pdfIn PDF document text
    • http://givemuzod.epizy.com/rulufimimuzipovibebagoji.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/la_la_land_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/contract_dispute_lawyer_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/beginning_ending_inventory_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/jaxozif.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/kajowunarexogig.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/raxarepores.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/89990437194.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/2289818271.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_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 4688 bytes
SHA-256: d0e7c5ec5f66d3065e43ec1306f6f10f68a4e60837aae68fa37f6b0c9357b9bd
font_01_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 11204 bytes
SHA-256: 3dc26df2fc8e6fa0fa7b8689d7725c833b3aaf6976abfdc3a2e75bcb385b0c5a

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