Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca16c1570d69a57b…

MALICIOUS

PDF

85.2 KB Created: 2021-04-02 09:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ceae6a5353b7f60b8f7d4165183eaa2a SHA-1: d44374c4e463680f4349f73cd9e1ee8c70adbc8b SHA-256: ca16c1570d69a57b5c0834a1d086474de854be9996fb67fbd05b6837d8488d1b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=predicting+the+weather+worksheet', which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to a 'predicting the weather worksheet'.

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://nipisod.ru/wix?keyword=predicting+the+weather+worksheet PDF link annotation
    • http://koperorav.iblogger.org/vegutonigadunaxalumenofo.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/NgevTic/meme_songs_trombone_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/gUhzSO6/61219546177.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/icWWw2Z/sneaker_hd_wallpaper_iphone_8_plus.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/how_to_reset_pilot_light_on_worcester_boiler.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/Hjiignr/airtel_direct_data_recharge_code.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/pusori/abinaya_album_song_masstamilan.pdfIn PDF document text
    • http://pazizota.rf.gd/tennessee_boating_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/mawitegunegawadamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc4cfac-5453-45c1-82b5-c6579ce3a40a/probability_and_statistics_for_data_science_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/97486224558.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/the_introvert_advantage_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52780c57-5dad-48ad-911b-3b4e4ebeca6f/32885329599.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/the_wanderers_where_are_they_now.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/ansys_apdl_tutorial.pdfIn PDF document text
    • http://pebulibupa.rf.gd/86295174080.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/map_of_50_states_and_capitals.pdfIn PDF document text
    • http://zuvemodu.rf.gd/gesujewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26c2b3b-cab4-4ea7-8d04-3601ec9ed7bc/tevido.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_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 5324 bytes
SHA-256: fe83303a9e422b5cce958838a069421c27d7faaa2bfa0cc67931a3413f65befe
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 11412 bytes
SHA-256: 44e840e3e99230931c9846fcb27a67fdd1551ffd989617f0a577e03b96207fa7

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