Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bd88ecd97bb2eb…

MALICIOUS

PDF

84.3 KB Created: 2021-04-15 18:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 983bada48d33feb7588a2aa0375c6357 SHA-1: 55f5690dcea1965888e72579b785f6ae0934cf51 SHA-256: a5bd88ecd97bb2eb3ecd5ef9da266d35f9ade1a852a1e58fab8a541d89b8a5b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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
  • 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://mezovuduw.ru/strik?utm_term=dante%2527s+inferno+canto+6+full+text PDF link annotation
    • http://hamlikjorettoop.ru/esperanza_renace_espaolmkads.pdfIn PDF document text
    • http://vamofawevized.22web.org/abnormal_psychology_17th.pdfIn PDF document text
    • https://xagiwejobumumok.weebly.com/uploads/1/3/6/0/136051235/5101122.pdfIn PDF document text
    • http://reawont.online/1706939289cyzyr.pdfIn PDF document text
    • http://wdd13.ru/iron_man_1_transcriptr3ynm.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/zixebitizapamuw-bugimojunowewa.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/imobilirio_do_Condado_de_ashlandhmnzt.pdfIn PDF document text
    • http://daravto18.ru/developmental_milestones_chart_24-36_monthst3x1i.pdfIn PDF document text
    • http://fodujijosezobaw.22web.org/how_to_connect_two_ue_boom_speakers_without_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/fja7hiz/car_driving_experience_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/pekuwalixeso/idgga7r/51132766090.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/0fb59e3b-906c-4e20-a5ec-204e84170901/walter_benjamin_illuminations_sparknotes.pdfIn PDF document text
    • http://napenexin.epizy.com/centrifugal_pump_handbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f29076e-2451-4633-8988-67cbe07e386d/continuidad_de_los_parques_julio_cortazar_analisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32d7760-e84d-407b-849b-15f37fe404ab/rixoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/dongri_to_dubai_marathi_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649bff11-1361-4ab1-add9-9f2dda15c871/sekaz.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/fazor.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/the_frankenstein_chronicles_season_1_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d8cafb-d45c-420d-a3ab-fac0ec2c5111/12220113515.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_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 5128 bytes
SHA-256: cbe2ad31e5dc29a1136d1948732afab3d32a13528b41672d54d9e43741e0698e
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 10388 bytes
SHA-256: 597696c9fa99441c53b452532de9295c8c696c84068b16e7473e28d5a9a30cb8

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