Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de097f31c17e1da…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 17:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ecfe77d979ff118ba2003d8914f391cc SHA-1: 14e7a9d7f1d26415481ddb07e09fd4ffd423174c SHA-256: 4de097f31c17e1da4e21c5b3e7a97e855e21cef1d56263624622b3b73008bc53
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely the primary lure. While no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=dewalt+dcd771c2+20v PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fd7cb56d14dd.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/34868728819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_602a10f430472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459791/normal_605489c03dd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_6009c896c3ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fd73060ca62c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/33907568211.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/buffalo_ny_car_accident_reports_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/bazokig.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/yokatta_dx-_9_bundy_clock_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/rusixepepavejediw.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/99208541661.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/gw2_crafting_material_guide.pdfIn PDF document text
    • http://xuwixevuje.rf.gd/35743134338.pdfIn PDF document text
    • http://xoxasosopu.epizy.com/excel_2010_checkbook_register_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/conjunctions_and_but_or_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/59366263119.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/catastrophism_and_uniformitarianism.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/walomowuxevesedatudapid.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/where_to_get_cpr_aed_certified_near_me.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 5216 bytes
SHA-256: 3bdc09249b580d2970381b1caebafaf7d4816066c977daf0103851f8c699897a
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 20428 bytes
SHA-256: 60eb425e0861d4678701fc4b3c5fc1ff391db9844611a63871f384ee3f6a7c2f

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