Malicious PDF — malware analysis report

Static analysis result for SHA-256 db759a4eb89ebc9e…

MALICIOUS

PDF

110.4 KB Created: 2021-03-14 11:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a90ce9639415ae50e9e99f23d4659d2c SHA-1: bfa0363afe31c8c7870049507762892afbf039f9 SHA-256: db759a4eb89ebc9efad971dba35c51b46fab6a962458173c542449b6fc4c774e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, suggesting a link farm or redirection strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=que+significa+ctm
    • https://wulelosen.weebly.com/uploads/1/3/5/9/135992808/7710720.pdf
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/gapokozatimi.pdf
    • https://loxujuzif.weebly.com/uploads/1/3/4/3/134368844/nakabipejimonapulu.pdf
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/4919921.pdf
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/761030f66983a.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/mofurorexojifuru.pdf
    • https://muberelikaxisax.weebly.com/uploads/1/3/1/1/131163953/goxar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvokejixu.epizy.com/reading_comprehension_for_esl_students.pdf
    • https://uploads.strikinglycdn.com/files/54f21e49-939e-41b5-8c42-4e34b9fa335c/ncert_solutions_for_class_12_physics_chapter_1_download_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/620b3600-5c76-4b8c-9543-e46f96caaa87/anna_kendrick_scrappy_little_nobody_quotes.pdf
    • https://uploads.strikinglycdn.com/files/c126bf19-19ef-407e-a140-6b3fa005fc11/lamogebe.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_d4342ac1b36044839acbff75624efdaa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/563438ca-9d4f-437b-a314-e3d85b561914/how_do_i_save_an_email_as_a_on_a_mac.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_eb4f61f50ab348d88b1370abb2a8fa44.pdf?index=true
    • http://patabajisof.epizy.com/salolida.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_1b6c8c7825d64f93ab3cd231036d3c0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66262f62-7613-4e48-8702-52ee4f80950b/what_to_write_in_my_performance_appraisal_examples.pdf
    • https://uploads.strikinglycdn.com/files/9820ff92-4efd-4a87-926f-ec755faa897b/how_do_i_reset_my_uconnect_2017_ram.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_8e5ef50f33ea41b6bb8f6d7021b45375.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f05.bin
ca6bcd5d183d73e2de4be942d6cb195c45cbd0c0614b104dd6084461ddd06317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F05 5136 bytes
font_01_sfnt_off00018079.bin
e2c74139b3ef237d80d1fa7387af8389075be3225c54a5d981a2fbf5aa29e222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18079 13012 bytes

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