Malicious PDF — malware analysis report

Static analysis result for SHA-256 f103483c4e16aee3…

MALICIOUS

PDF

69.3 KB Created: 2020-11-24 19:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a3d32e5c3052ce2df9b845f4e5df006b SHA-1: bb0f5170aefe49893a2d3e9411199e8ecb65bb01 SHA-256: f103483c4e16aee330f518f137081e0a9d3db6de420aa1ac8c7b78317f4dfe94
96 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL points to a suspicious domain, likely for phishing purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffnew.ru/123?utm_term=constant+mesh+transmission+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fb2b47e757a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_5fb9c9ba31925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f95250c9a678.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/jidagafinuxesu/buy_formal_dress_online_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/soccer_games_head.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/xebejur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5cdcbe-14be-439c-bffd-99a61c1409e3/44074332004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374e67a4-82d0-4eea-a50c-9e29ba265588/eastern_air_lines_flight_401_ntsb_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/diludaxuxunuja.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/american_civil_rights_movement_crossword_puzzle_answers.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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 4900 bytes
SHA-256: 72b8e23fbb7ac7b43b586a20ac08a2dcb9ca6444797513e2fd1254ffa910eb9e
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 9900 bytes
SHA-256: e7fee4842842f1897f27e6117ded640a896033476261622a1b2c2d5fc707d95f

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