Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cb1fae13fb1d81…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 08:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dd30981e2da4c9aafbf92e347271142 SHA-1: 3f554deab0393393a629224f6daf321524d4c497 SHA-256: 26cb1fae13fb1d813231a41c146589f6b771aaec0c6c826ac9c18767fd42de57
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure related to 'building maintenance definition pdf', suggesting a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=building+maintenance+definition+pdf
    • https://cdn-cms.f-static.net/uploads/4424349/normal_60275813574f6.pdf
    • http://diluzadumavotux.getenjoyment.net/windows_10_startup_batch_file_not_running.pdf
    • http://spindlndou.space/el_mundo_de_sofia_pelicula_completa_online_gratisyq36f.pdf
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603866314e951.pdf
    • https://cdn.sqhk.co/motuvitewodi/cmhcibr/9288611473.pdf
    • http://ilkertr.shop/crate_powerblock_reviews8yh9.pdf
    • http://bonboxstudio.com/a_shepherd_looks_at_psalm_23_study_guide3dzel.pdf
    • https://static.s123-cdn-static.com/uploads/4426279/normal_6003a889a0fc8.pdf
    • http://blockingscenery.com/kitisu334de.pdf
    • https://cdn.sqhk.co/sesijisova/haieieX/45280909700.pdf
    • https://static.s123-cdn-static.com/uploads/4446776/normal_60048e0068d48.pdf
    • https://cdn.sqhk.co/baxotonad/gh7agfh/wings_etc_minooka_il_menu.pdf
    • https://cdn.sqhk.co/jujegopenop/PfUgeWS/checkers_board_game_online_english_draughts.pdf
    • https://cdn.sqhk.co/rijakobebux/hih2Qgj/22662423128.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://revudipepofaten.myartsonline.com/how_long_does_a_bone_callus_last.pdf
    • http://vitekek.epizy.com/starting_a_business_in_ohio_guide.pdf
    • http://dipagepe.atwebpages.com/11840346778.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_7368864ac51d4212bbd831009b14034c.pdf?index=true
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_087c2aa278094ef19b57ec8ffd6ae3d0.pdf?index=true
    • http://josatagosovux.rf.gd/cctv_camera_hacker_app.pdf
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_38185987b4ef4fb1b5f322e2f4a89908.pdf?index=true
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_738d13d1a3754fdba97e35ee1bc4460e.pdf?index=true
    • 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_off0000f8d7.bin
d9420ad46a248f8c42e7a7bcec7036fa3111b432f54e21d99c330dea7a60f9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 5252 bytes
font_01_sfnt_off00010aab.bin
c7d76c22aa95251bd4e545e661a0b833ca296705bad7ae2651b483f4fe0fd451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10928 bytes

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