Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1b7191e0d2137…

MALICIOUS

PDF

72.2 KB Created: 2021-01-11 07:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bfcb5b1ac8b08647a9f331291c2465dd SHA-1: 782d5c97cd04792947eec5f34f5140bf1dca0e52 SHA-256: dcd1b7191e0d213794b2b1f58efa9b9dc0d38b3fec38583d801e60157f1181d8
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL 'https://traffset.ru/aws?utm_term=asus+usb-+ac56+driver' suggests a phishing or malware distribution lure, masquerading as a driver download. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common in phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/aws?utm_term=asus+usb-+ac56+driver PDF link annotation
    • https://site-1172409.mozfiles.com/files/1172409/colorful_monster_kaiju_coloring_book_free_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f89b4c97cc01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_5fdaabf680132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff11eb907c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fa2a403d9304.pdfIn PDF document text
    • https://site-1180454.mozfiles.com/files/1180454/cancel_livephish_plus.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/55036696315.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/xukanomarexumu/cross_join_cognos_report_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/jiwuxaponi.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/nudomiruzalamugadofanebo.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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 5400 bytes
SHA-256: e8f4b60af3b8172dd7683184d61800adb32b78bd95af33bc13d6479f33e446bf
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10296 bytes
SHA-256: fb51be596d5b6141c7d8462ac1c14b6ba286359f9e4b07f456e0b7d706e8b061

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