Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f266321e9021fc0…

MALICIOUS

PDF

75.7 KB Created: 2021-04-06 08:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61eb8bd108419dc1b3f295fc6a18f757 SHA-1: 7584d753c4179366e86f1cc94d5380aa4f958411 SHA-256: 7f266321e9021fc0124f796de3d97a7378c779239d079e3590509c41e3e5fb77
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan', and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://pelibifir.ru/aws?utm_term=how+to+check+for+a+bad+idle+air+control+valve
    • http://uscreditinquiry.info/tcp-ip_stack_equivalent_to_the_transport_layer_of_osi_modeluqwza.pdf
    • http://dawexefif.getenjoyment.net/laramie_project_ten_years_later_script.pdf
    • https://static.s123-cdn-static.com/uploads/4421614/normal_5feebade451fa.pdf
    • https://cdn.sqhk.co/nolagutotato/4Shjlhe/77596500316.pdf
    • http://fegubel.iblogger.org/56535385581.pdf
    • https://cdn.sqhk.co/najafizox/gihhjha/zesegibozonarewijej.pdf
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff3e73a99621.pdf
    • http://istlan.space/southwestern_american_literature_journalvjjq7.pdf
    • http://oneitstore.pro/dizigipagidojiratuwadal3zbvz.pdf
    • https://cdn-cms.f-static.net/uploads/4376372/normal_6031cc01e922e.pdf
    • http://viwavidif.getenjoyment.net/smoothie_recipes_healthy.pdf
    • https://cdn.sqhk.co/bepasasa/ZIqhalx/sqlite_python_tutorial.pdf
    • http://twenty-promo2020.ru/22935672431v4b4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/343c32ca-8d14-464a-998c-755b81ca99ac/juvutaluduxozeramef.pdf
    • https://uploads.strikinglycdn.com/files/a6f54907-39b9-4b11-829f-4fddb494771c/bash_scripting_tutorial_for_beginners.pdf
    • http://kexeban.rf.gd/all_about_me_elementary_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ca67804e-433b-4bf4-84c8-06f4fbcbd8fe/financial_peace_dave_ramsey.pdf
    • https://uploads.strikinglycdn.com/files/dec428e6-ffd9-44a5-b8be-189c3ed267c5/graphic_design_school_nyc.pdf
    • http://xobofob.rf.gd/latest_treatment_for_typhoid-_fever.pdf
    • http://jowokepo.atwebpages.com/86251493564.pdf
    • 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_off0000ebde.bin
f450d82f0973d0714275288fd9d6d9996f03c5b12095c18b20d775e810a6f19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5248 bytes
font_01_sfnt_off0000fdc9.bin
79dfdfdd599092e7c6d20365877bc2803215c9425b97b0648e2cca8fe2a26e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10412 bytes

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