Malicious PDF — malware analysis report

Static analysis result for SHA-256 b154bc3e5b7f6fad…

MALICIOUS

PDF

72.4 KB Created: 2021-01-01 14:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 18299b858830c595c9778a3b810c00bb SHA-1: e8deab5d3c1c982f63c70af6ced12c26fe5f8ce5 SHA-256: b154bc3e5b7f6fad1231a240af4cf4ec6a3e2235078363e69880251702e413b5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack vector appears to be a phishing lure, directing users to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=college+general+biology+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fd1e75600473.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/Vjjgcs1/android_mobile_latest_ringtones_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f9549ceb86e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fa332881ba2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8701147343b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_5fde7e346d2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fad6029cf603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fd61a97e041c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fd110e412696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500432/normal_5fabbd17e83c6.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/257e9616-6359-4770-af79-848d4171ea9e/caserias_ensangrentadas_buchones_vip.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/oras_pokedex_completion_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88959ded-6cd2-40c6-8d06-d75cd060f5ff/74894040378.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 5312 bytes
SHA-256: 8b6a2194c33d7a6155693e46ae0f6a2d6c6622f4c1fd4a33054a626ffb7310f6
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10144 bytes
SHA-256: a699958fa2439a106f29fe828ec35791b3344a4d270822cbe17f0b11d5329e40