Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d7401a2637d867…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 20:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c7f9382f1b4ed4b0bdaa533777820ab5 SHA-1: 7a68863932d5c56d347b51cb845b545ef9f00cd9 SHA-256: 19d7401a2637d867b409c0d37b08b327e22b2e60cfa629cf4f44bc2314e2cb57
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 phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to SEO manipulation or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=track+and+field+rules+pdf PDF link annotation
    • http://sodazetibup.iblogger.org/fundamentos_tecnicos_del_voleibol_voleo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5ffe6c3d47c35.pdfIn PDF document text
    • http://help-igcopyright.xyz/8258765801eq2fz.pdfIn PDF document text
    • http://atlas-copco.su/a_queer_history_of_the_united_states_ebookbzq1v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_600a96e699391.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/13056584859.pdfIn PDF document text
    • http://gawaxoxirerefi.22web.org/notting_hill_movie_720p.pdfIn PDF document text
    • http://weinmvc.net/adding_and_subtracting_fractions_and_mixed_numbers_worksheetaann6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_601261d98431a.pdfIn PDF document text
    • http://onlinetyz.xyz/87716422128rt8ol.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/8bc085e7-ce33-4a06-af68-556f7ffc7945/19148412250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c288aac7-1b36-4584-86b8-9c565259fc5a/silver_eyes_graphic_novel_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2d436d-8d93-48ef-be9d-c22e463a1951/anti_inflammatory_diet_meal_plan_indian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8710e131-cb9d-43da-b49e-fec5776aff91/dovemonitulirisirisuzuves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e793291-7554-46ad-94fc-8f866b9347ed/56710847033.pdfIn PDF document text
    • http://xexasuwoxomiba.rf.gd/pugemofezoxubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1159f8-c3e1-4fc3-a196-e620654116a8/what_does_e02_mean_on_coleman_hot_tub.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_c37c8e21eb9e4721a2e26c5cd1d88d25.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_53b84909e6b1490da3d3d4d645e7f767.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_bd6dc6692dff4b5eac73a63b1106f195.pdf?index=trueIn PDF document text
    • http://savefativiluz.epizy.com/48762650439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbde9db8-6728-4e6a-9f3f-a1602e4fad20/que_significa_slip_en_un_carro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec5a8f2-8e8d-4476-af2b-5154a218eb6d/sakuxebazawuvavenono.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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5160 bytes
SHA-256: e6f97522fde46bbe2f4eb1d07a239d978a7a3e7065618ee3e65b483dbed3b0d8
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 9904 bytes
SHA-256: ec1cdd74188f7a06487201e48a1dfb76ecda24fcb3be641afdd11653fac6fbd1