Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c28ddb1800ff2e2…

MALICIOUS

PDF

70.2 KB Created: 2020-12-23 00:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e48aa63e039d41862b2d2c1ec569201c SHA-1: 4396786ef9da8d13a297d31ac56254d097bc85a7 SHA-256: 2c28ddb1800ff2e201a51e9977372f29631cf3d06d496403ce7d513e1acf7977
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The embedded document body, though heavily obfuscated, contains text fragments related to 'reading street 2nd grade spelling words' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=reading+street+2nd+grade+spelling+words In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fb520c427a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fb8122bc052a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fc0cf69de528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fab66e4048e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_5faba790493b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fda7a2bccdba.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/0549ced0-0e3b-4884-a48c-ac759e3e59f9/18351026207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ea2be9-1ff8-4d56-b2da-c7bd7e521f18/detegaledig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e405c26-896f-45d8-872f-7fd2190769be/math_skills_resistance_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b1361d-e6f1-439d-ab47-d824dc1e001e/45_sec_timer_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aced750-1ea5-43ef-8417-4db36d1458af/52453971420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022ccaef-166f-44d0-8a1b-81876649bb2b/pure_life_keto_side_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3a40e0-334a-43e9-bd50-d727bb08e348/64241543190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21fd0e2-4a9f-4009-9e9f-175c8d0def6e/mipugutemajuremo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/define_an_acoustic_performance.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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 5144 bytes
SHA-256: 4ebae23d9805d21511ac5208f74fe9506cf323049ecf3ede35c350d97faee405
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10868 bytes
SHA-256: 9e07376dd980534edce0319279426c4a24ed649c93722e2b4c4b67f2d52b3c60
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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