Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d5d280d2953b8f…

MALICIOUS

PDF

77.0 KB Created: 2020-11-12 23:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bb26e51884e703a5c298d95f0c1b3400 SHA-1: bf8f375c2db27bf9c8a55b4461fce7bdffe92167 SHA-256: 83d5d280d2953b8f08202f14d347fbc8ea31cfb3182c183b61483bd14af2f773
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, disguised with a seemingly innocuous search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=alabama+crimson+tide+basketball+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5f9928399ce13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5f97fde3419df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fabf558814d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fa66d1c37f06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5d962dca-3418-4b47-a56f-f5e1948a50c3/teenagers_preparing_for_the_real_wor.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/bopigije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd45748-6331-41ab-a2c3-6e3561a5fc97/sefinidikeliremuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1730edd-6562-430e-9e17-52c4b32f5453/togaf_template_architecture_definiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14e4f45-6c4d-4342-86ec-45970a975fca/75293142563.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/princess_diaries_book_3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc69d64a-4f3a-4945-b13a-d8b224182586/guitar_solos_to_learn.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 5252 bytes
SHA-256: 3be00481843f28f92f1b7e330f547e4c034e02a10f1af1ef299bd7bbfca76266
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16188 bytes
SHA-256: eb93a5af5f43e0035644bc3ee54f3941921ef926f34c5bafa8366eb4bce48431
font_02_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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