Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4de82f949d927fa…

MALICIOUS

PDF

61.9 KB Created: 2020-11-13 08:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd7dbecc28819f87d619f66aa65d7c26 SHA-1: 1ffe2ba53f9bf0f0269bbb049720bfb2358ef08d SHA-256: d4de82f949d927fad0ad5096a632e5923b2d4e5661fdf285cdbcb7a42ff8007d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'trafficel.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://trafficel.ru/aws?utm_term=correlative+conjunction+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381321/normal_5fa3cd1683a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5f95a0537147e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f93a82e50615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f870a180201d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_5fadff10628e3.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/894f7ac3-561e-4666-8fab-5c60d0250db7/boy_in_the_striped_pajamas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bcce757-4277-461b-b5b3-55d336fc6cd3/kukurajugizarikabasaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa507841-e124-4c28-8608-b84f8bc4a8c7/27002938154.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/yaesu_ft_7900r_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/calendrier_2019_octobre.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/chlamydia_trachomatis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/badanamu_ponytail_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB81 5224 bytes
SHA-256: 4d24eee95b4ec883023993be7f08397e0130abcff445a097dd426a21d957818c
font_01_sfnt_off0000bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 9256 bytes
SHA-256: 2f0ed99a84ce2df5236d40900f72d0b0c86c6540ffc3a38a91827c969acd9ffa
font_02_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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