Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a84b4505cc6b69…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 20:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f4b02e25d31455802de05dff8e252ce SHA-1: 20ec39923756d072a0da8fc633b69022e1f553b5 SHA-256: b5a84b4505cc6b696a929ce52fb19873d61bc829f93a3ff061799f0d5da4fc14
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, which is also listed as an IOC. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text that appears to be a lure for a mobile application download, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=shuffle+cats+mod+apk PDF link annotation
    • https://cdn.sqhk.co/jalosemuv/jgeies4/rolling_stones_gimme_shelter_altamont_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jt5igcK/cupcake_maker_cooking_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/gMAtjb9/rival_stars_horse_racing_desktop_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/j1TCQic/idle_theme_park_tycoon_horror_island.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/KdhMhcp/piggy_boom_gift_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/IFahhhj/tuzaridowasifot.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/2Thgdjg/vuxixuwegukopowuzad.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jcii1dG/poninejakapakev.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/setaxilitozuko/joining_r_handwriting_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/chemistry_textbook_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/kibagadelija.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/resident_evil_4_apk_full_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/tazeforolidajodib.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/todinefole.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/gifaxarujadarevoputojuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/20568244663.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/measure_area_google_maps_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/basowamofaropunatelu.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/crossword_puzzles_daily_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/35474466921.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/togolixegexavugek.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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 5468 bytes
SHA-256: 11c2920918522789dc89dd55b007894ffb7a9ea0128de8090881b7ac80b2c088
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10812 bytes
SHA-256: df04f73297939494593087da5ade8f02506183876e5af8d671a506ee5e26f925

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