Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d858744e86e51a…

MALICIOUS

PDF

93.0 KB Created: 2021-03-11 23:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81826fe296bd5daaf1c283c71603fc05 SHA-1: 4112cd691f771e1d9ff851faa30df57a9e5f1a37 SHA-256: b7d858744e86e51ac4c38e77fcc5aac643df8da796361e8eb6b6cba45b398e57
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a password-protected archive lure. The embedded URLs suggest it is part of a phishing campaign. Although no scripts were explicitly extracted, the presence of PDF_URI and SE_LOLBIN_RUN_COMMAND heuristics suggests potential for executing commands or downloading further payloads, likely via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/123?utm_term=attention+getter+for+informative+speech+caffeine
    • http://jsexj.fun/1163094946go3jm.pdf
    • http://com-connexion.xyz/58922129463mwkjc.pdf
    • http://lazadacostumercenter.com/jezafozebafimepapubohcf4j.pdf
    • http://1fps.ru/949744892731gujl.pdf
    • http://kismyketio.com/cmd_command_for_viewing_wifi_passwordkyffp.pdf
    • http://jovefupe.mywebcommunity.org/guxagagikojimiwuk.pdf
    • http://mishgen.com/febivozigataxunulas4lsi.pdf
    • http://pipvip.ru/object_oriented_analysis_and_design_tutorialspoint9dtcc.pdf
    • http://xutifufaxe.mypressonline.com/convert_file_to_word_format_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/fd890d6a-1abf-4ca6-af84-e825df0ef6d9/betiwevu.pdf
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_0e4ca9c1010347ff87640b02ceec4d4f.pdf?index=true
    • https://s3.amazonaws.com/gafedupeba/sujibilaxabemazov.pdf
    • https://s3.amazonaws.com/risisipajole/craftsman_16_gallon_wet_dry_pump_vac_manual.pdf
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_d1619026277548968d8fb5fd100b0cd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ee2d8e6-74bd-48fc-8e74-737db0625e3f/10921240267.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_36d55fdcff1f4922abb8ba7f7ac8b65a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c0ed4053-175a-49e9-b38c-fd04fcbdd037/california_highway_patrol_citation_number.pdf
    • https://uploads.strikinglycdn.com/files/8828f94f-cab1-4897-9221-ca85ece41879/86434616345.pdf
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_0ed0ae9efc594af08bc40e65d0b7c97d.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6da.bin
801e33dc83f66a5f9c9af8942ec3033086bcd0a76bd9a5a23ab4da1dba61c16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 3016 bytes
font_01_sfnt_off000101af.bin
86f3dce302af096005c2fbdfcd3711766cb8fdb3ea7239fb94289fd4da6d6466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 5448 bytes
font_02_sfnt_off00011410.bin
ae256286d09c5ff22c3e9ae6ef2b9070ce59ab356bef6522116daed008314d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 2304 bytes
font_03_sfnt_off00011e89.bin
9a07c7f75496b9b8fbba5be945c8bbba28c30ad0e62b0cdd4efbf864171bd609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 11412 bytes
font_04_sfnt_off000145a2.bin
8269566c0aca034e4a3163b392c7fdedd2b2eae651d6854d41b941bfb4b4c5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 16244 bytes
font_05_sfnt_off00015b6a.bin
abba5184f79ea77d30387136f11ec434ec6a5d979ac004b2ff2b138e99711976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6A 1964 bytes

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