Malicious PDF — malware analysis report

Static analysis result for SHA-256 141ff28ea55570dd…

MALICIOUS

PDF

69.9 KB Created: 2020-12-29 11:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c9c2bd573234acd36673b2f31ca3c228 SHA-1: 1900bd0f7de33693241a5f3d60c73f4159949aa2 SHA-256: 141ff28ea55570ddd14480a67a3a0b4d215aaf551225034df0608f33083eb4ad
136 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it's a password-protected archive lure, commonly used to bypass gateway scanning. It also embeds a URL that appears to be part of a phishing attempt, disguised as an exam schedule. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffnew.ru/123?utm_term=uconn+final+exam+schedule+fall+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8982af728aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_5fd759b67ec3f.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/db90e8ec-f597-4de2-a4ab-bcf13f13a2da/baml_bamsz_deiken_rnekleri_psikoloji.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/nufifiwilobilikem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c21d03f-1a37-44b6-92e7-994d14e6049d/chemistry_1_practice_electron_configurations_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/suvagarikidavirewep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b42813-7fd5-4573-b315-e7a92a86e1ca/jutakarabevilosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e54f89-5e28-4b7d-bd4b-02d9e61da324/spoken_english_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abce5def-951d-4671-b3a1-b8dd95f2d3e0/xovaz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/weekly_action_plan_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d4e023-8804-42eb-b62b-746eee34a797/postal_exam_study_guide_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa8563a-75d8-45bb-8fa4-feea086c4d62/social_security_card_template_fr.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/fafoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/xozosilekelosepexawin.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_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 5496 bytes
SHA-256: 8c24dc1c395fc49b971f9a49a55bf556933cb2daee07956b3c7b5cae464be7d6
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10820 bytes
SHA-256: 68f962ff4cf525b69a0b570e2de9869d25266f98590d115d81e856c818be3ec3

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