Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d041e86f23d4640…

MALICIOUS

PDF

66.5 KB Created: 2021-01-02 14:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f41e5114310c47d454d2a42adb30ca41 SHA-1: 6094ba4926a976ecc14cf96801fb6df1e542d405 SHA-256: 6d041e86f23d46405c8554218e52c89a6fb9e2cf4705b53c96ea17e1c25106a3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, which is likely a lure to encourage clicking the malicious link.

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
  • 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://traffmen.ru/123?utm_term=parts+of+a+sentence+worksheet+4th+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5f8dcde038ed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fe185f6095f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fc8898f1d110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fee6a1d77a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd1ffb738efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f95ebddb66e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8c98aef2af0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/printable_activity_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b1f27d-cb4a-4330-aa9c-9d8450ce9034/tsm_4_beginners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1644bb7a-a553-42c8-adeb-e23811e0d592/83757049435.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/catalogo_balatas_wagner.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/breastfeeding_older_children_and_husband.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ziwowonefozudabebagal.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/bachelor_of_science_computer_information_systems_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0033fb-c88d-495a-bc8b-4749c453b75b/97097546840.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/rascal_film_all_song.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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 5496 bytes
SHA-256: 38128392295b47d9c5de05b23bea3f25a34bf762518fed8c3693d0b078a36946
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 10164 bytes
SHA-256: 7402140cd6d7bf44ff213c3fc2f6a417dcf5568bffd188e5dfe93a2162b4ce99

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