Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5c918fb854ff00…

MALICIOUS

PDF

98.4 KB Created: 2021-03-13 20:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ef8b1df854797acecc7675d1fae4d2c8 SHA-1: aa62da1ee3e81fb8fc56c44f7b7479e7075f47e2 SHA-256: 0a5c918fb854ff000b27622f706560490e77c11a7d0fa8595321f57183236051
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick users into installing malicious software by posing as a necessary browser update or extension. Multiple external URIs were found, with one pointing to a URL that appears to be part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/strik?utm_term=google+chromecast+h2g2-42+jp PDF link annotation
    • http://lomidal.mygamesonline.org/19227332358.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/autocad_drawing_templates.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/pivusivaginikugelupako.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/anomaly_detection_survey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://natexekazedap.epizy.com/bostitch_miii_floor_stapler_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/tragedy_of_great_power_politics.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_38ff45686a954cc09f309c7dd8c8c0f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/aswb_bachelors_exam_practice_test.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_b24b7cac74934481ad18bfd9db52ea35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/citroen_grand_c4_picasso_manual_uk.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_cd92e2e95e5f454699b7b4d271628dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/titugome/education_website_psd_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/kofazumidogupiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/notivarenipepozorelo.pdfIn PDF document text
    • http://vuzujalaj.epizy.com/xebezirakiwamowifinivimus.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/a_wrinkle_in_time_chapter_12.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/bodoni_std_bold_condensed_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/xifoxezemopilinukodeveg.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/8th_grade_math_algebra_1_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/tukek.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/phonics_alphabet_sounds.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 31728 bytes
SHA-256: fbe151d57a47f6a90723a1ab31c657e1eb975181bacb3ab4e2d5119f91c3132d
font_01_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 5340 bytes
SHA-256: 57adf069e59a69d5e408f31b549d6e75109708ad3cad025418e6bb9a1dbc341e
font_02_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 11448 bytes
SHA-256: df3158a798877f231ab904f8d84cb042fe7ade45bd6879c4a7b9208606f13170
font_03_sfnt_off00016d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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