Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18987c4c28cd0e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 23:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 289ee77b814263f440bd383a094640d3 SHA-1: ddb48a9d82ed6fbca191c85f2493a03d301a6985 SHA-256: 4c18987c4c28cd0e9d2db3d3fbf504f34f46d71b07f5d3d6f29ddb8b8ccb13d2
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'nipisod.ru', which is likely a phishing or malware distribution domain. The PDF structure and embedded URLs suggest it is used as a lure, potentially for spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=ir+spectroscopy+principle+instrumentation+and+applications+pdf
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fcebd92cc127.pdf
    • https://cdn.sqhk.co/jipuxoxukul/lihh97R/touching_snake_venom.pdf
    • https://cdn.sqhk.co/bemapebe/ihfheoX/40964129806.pdf
    • https://cdn.sqhk.co/givifevulo/iUaZihP/lifem.pdf
    • https://cdn-cms.f-static.net/uploads/4500438/normal_6031dd0f1622a.pdf
    • https://cdn.sqhk.co/sawibevas/Phdjcgh/direct_free_kick_soccer_rules.pdf
    • https://cdn-cms.f-static.net/uploads/4449406/normal_603662ce1a86c.pdf
    • https://cdn-cms.f-static.net/uploads/4459941/normal_5fd18402a8836.pdf
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fcbd4ac824d1.pdf
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5ffc9736454fb.pdf
    • https://cdn-cms.f-static.net/uploads/4425726/normal_602c31a07e838.pdf
    • https://cdn.sqhk.co/gobuwovuv/IgWhgia/netflix_fees_going_up.pdf
    • https://cdn.sqhk.co/gamakokub/gdRNoEM/oxenfree_achievements_guide_xbox.pdf
    • https://cdn.sqhk.co/liweruruzed/bgighEJ/78026039004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/205de0a7-0827-4c6a-a167-e571963e66c7/givanule.pdf
    • https://s3.amazonaws.com/sakaburepagase/77814673234.pdf
    • https://uploads.strikinglycdn.com/files/851830f2-4a21-45f5-b12a-2967834ecc4a/hp_elite_8300_release_date.pdf
    • https://s3.amazonaws.com/fosagoba/29706331874.pdf
    • https://uploads.strikinglycdn.com/files/cf87266e-7ec7-436f-9da3-66b80a142638/how_to_connect_auvio_speaker_to_computer.pdf
    • https://s3.amazonaws.com/xisakazelelinim/5_paragraph_essay_outline_for_high_school.pdf
    • https://s3.amazonaws.com/vibasujefir/holmes_air_purifier_filters_hapf600.pdf
    • https://uploads.strikinglycdn.com/files/607f53f9-b78f-4342-96be-3454d32af211/is_there_going_to_be_a_5th_diary_of_a_wimpy_kid_movie.pdf
    • https://uploads.strikinglycdn.com/files/9b1d73ab-b2e4-4455-a9d9-ef807bb3cab2/coordinate_geometry_formula_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001031d.bin
a1ddb426cdbccc49637eaa0ff8b728e68639ce9575668630aa227fa3396b06ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 5340 bytes
font_01_sfnt_off00011538.bin
20f9bb95185b298386bf825dde3f3eb596e597dbffa7faf0cdfd852261a956a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 11612 bytes

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