Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a0b151cc60f841…

MALICIOUS

PDF

80.7 KB Created: 2021-04-13 17:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a2ae0f5905f3bf650ecef314aa51d97d SHA-1: 9488bbcf2913d2c9386fe07fa90c87bfe76d0cda SHA-256: c1a0b151cc60f841a04538145a1008ec7f40e1b5cf0f8b104662432f00f665c2
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a search result for a technical topic, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI are indicative of a phishing lure designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=sklearn+decision+tree+feature+importance+plot PDF link annotation
    • http://tetiviguxawik.getenjoyment.net/adding_and_subtracting_fractions_activity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_601491816a915.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/96548857082.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/infosys_on_campus_placement_papers_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fca5843670b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_600a90588a7e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukokumo.myartsonline.com/62467308560.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/how_to_be_percy_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb34747e-d5cd-4a1b-9012-f16e99abe15f/51375266988.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/school_leave_application_format_in_english.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/convert_file_in_word_zamzar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3792f6bf-2247-4239-a8b6-4d4492389b24/how_to_improve_memory_psychology_today.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/pefabuxazazomepewis.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/what_is_an_example_of_a_possessive_noun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea5745b-676e-4483-900c-4db7ce8bb1cf/marshall_dsl40c_tube_layout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121fd0cf-f50b-4100-b032-7a0239b5085b/how_long_does_oh_crap_potty_training_take.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/apache_tomcat_server_9.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_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 5468 bytes
SHA-256: c912e6a283bb678f67b9d91950566f39fd8af28d6efdf6e673e65bbab9f2c169
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 11892 bytes
SHA-256: 4192b422a09add04bc186125104c371f0382a4ccfdb41026475b3948575810bc

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