Malicious PDF — malware analysis report

Static analysis result for SHA-256 333bdb5ddb6cdf7a…

MALICIOUS

PDF

64.9 KB Created: 2021-02-15 12:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 637e9c8f0cc4b17f2c7466891b2faead SHA-1: b71abc4ab6790281e317a34af710c9f50e0b26c7 SHA-256: 333bdb5ddb6cdf7a980092b3e924ec6e6793c38c4c81af0ca7cabe04607408a7
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple unknown URLs suggests an attempt to redirect the user to malicious content or download further payloads. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=eric+foner+give+me+liberty+volume+1+5th+edition+pdf PDF link annotation
    • http://carbackseat.site/descargar_appvn_apk_ios1pr2e.pdfIn PDF document text
    • http://missunik.space/wefizobavigefanuzosapv5ixl.pdfIn PDF document text
    • http://mxbur.fun/18135515242oefl5.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/cgejjfv/mini_craft_new_worldcraft_game.pdfIn PDF document text
    • http://8gusevshop.space/laguvitufaslh2h7.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/cuiiwia/brother_speed_rivals.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/ejdL2sa/nezerofuvow.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/r67VhcN/tinapotozawavatilalutibaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/hhjaPhf/64572165169.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jdjhtgX/std_10_maths_chapter_11_gujarati_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/ZmKhcgh/62327788522.pdfIn PDF document text
    • http://20970907.net/big_winds_used_gearqkg43.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/jemisajoda/42726975134.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/kyoto_osaka_japan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/computer_forensic_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/autocad_electrical_2019_user_guide.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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 5616 bytes
SHA-256: 4478cd2f0bb4d5910d055131995ea71286d4559b80ddb463f47387bd956ea7f9
font_01_sfnt_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 10776 bytes
SHA-256: 33a59c84fe8e726524eca23a14d68e38e7d186c3b30411fa5819b4c2dabc4c09