Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a8370e7c7c48c3…

MALICIOUS

PDF

172.8 KB Created: 2020-11-25 04:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca2d6927aa91ededecbd0c52fadb8e37 SHA-1: c891eee4da3ba89cf0939acc25dd06771422976b SHA-256: 10a8370e7c7c48c3ba96e78b5934feac60926dda1638b4b80151a7c6cabf1719
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to reference 'Olney elementary school pta', suggesting a targeted lure. The presence of an external URI and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffset.ru/strik?utm_term=olney+elementary+school+pta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413242/normal_5fafd78a5611e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f98020ac867a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f9718d824fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fb60575acea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5fba0ce13b8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fa51bc46b501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a13e7c-0657-4d7e-94f8-d7e83ef02127/42935417919.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/obituary_writing_format_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/game_insaniquarium_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db42b59-e84a-45b7-8b41-399e6aa13897/tagebugifajug.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/size_guide_blundstone.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/pre-_calculus_mathematics_12_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/general_knowledge_quiz_with_answers_easy_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/consumer_reports_air_purifier_ratings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e46c6f2-b8e9-4514-844d-97159f57c0b6/32179949203.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/mezumu.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_off00026efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26EFA 5300 bytes
SHA-256: c89cd383b6a44b6c20247ee19eac75b40f06918b1af41a8925607aefab204221
font_01_sfnt_off000280d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280D7 10984 bytes
SHA-256: f5634c159d49bac79ae1ede990b57ae0e7873ee4bdffbff173a8605cd871f58a

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