Malicious PDF — malware analysis report

Static analysis result for SHA-256 db569913aa47725b…

MALICIOUS

PDF

84.0 KB Created: 2021-03-03 14:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cc633df33455397a13f52d1aaf313d53 SHA-1: 559fd466be09213ed1d6497d4cba28009f0dc25a SHA-256: db569913aa47725bbb2e6cc63b5ba29d07ff3fbcf187e4cd52029bd3ec3235c5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML score, corroborated by ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to product instructions, aiming to trick the user into visiting the malicious URL.

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
  • 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://jacksth.ru/123?utm_term=shark+navigator+swivel+vacuum+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391047/normal_602b487f9b272.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/Z5eJgGz/paint_sprayer_for_cabinets.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/QhNjjjd/pulse_rate_and_heart_rate_difference.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_6000f3496ee84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fd33f90b9977.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/somisilegex/xogipekuwasagomewun.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/vapew.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/learning_chinese_characters_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/sazemare.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/ajogbajesu_twins_winners.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/netolazixigoloza.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/free_antivirus_smadav_pro_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/8079385505.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_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 5532 bytes
SHA-256: 8f6f8b84d92d9e5f3d66c4b512b8ce19998f1fc1e9fcb2d47a50978216664f25
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 12908 bytes
SHA-256: b22eae09cf4d867a47781d51530401b0c7ec0418c9099b192f11741798f85bc0