Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a52af2a612b30f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-23 22:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b904aa0f7ac91f4ae76d67e50bc22ea5 SHA-1: 72d5eb4ea60339fcab518b1fec82f3412d56a4a7 SHA-256: 12a52af2a612b30f069deb7b96d01f1c2ab449c6653ac261b2bf23d64dfcec33
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to text processors and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of an external URI pointing to 'nipisod.ru' and the heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly indicate that the document is designed to trick the user into downloading a password-protected archive, likely containing a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=procesadores+de+texto+para+escritorio
    • http://gagapazu.scienceontheweb.net/tirupuwedawixofoburitejiv.pdf
    • http://tozemudezajif.mygamesonline.org/explosive_calisthenics_free_download.pdf
    • http://bumufirila.mygamesonline.org/28415993546.pdf
    • http://bitiwiz.medianewsonline.com/list_of_silent_letters_from_a_to_z.pdf
    • http://lovelyhouse.online/petta_audio_launch_videowuxbx.pdf
    • http://fegiroxopirez.sportsontheweb.net/ashrae_handbook_hvac_applications_2020.pdf
    • http://tanubujurutemut.scienceontheweb.net/60455362247.pdf
    • http://vakotuwudar.22web.org/what_is_the_price_of_honda_dream_yuga.pdf
    • http://vknacruckalaikov123.xyz/migabajomusolweq.pdf
    • http://jujovobima.getenjoyment.net/apprendre_anglais_gratuit_debutant.pdf
    • http://goledipe.22web.org/50114872701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vidugozu.atwebpages.com/56688749310.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/59315938943.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_326722a99d044caeb0dd51f7b718de90.pdf?index=true
    • https://s3.amazonaws.com/tasufagijaremo/55121527028.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_6756a2adf85444e88ecc49e0382d0483.pdf?index=true
    • https://s3.amazonaws.com/bisapovepizaj/zukonibo.pdf
    • http://goxafebo.myartsonline.com/78305216247.pdf
    • https://s3.amazonaws.com/fatikonavori/interpretation_meaning_of_the_constitution_worksheet.pdf
    • http://metorudadoz.rf.gd/chandana_mendis_sherlock_holmes_books_online_reading.pdf
    • http://livirava.atwebpages.com/ensayo_sobre_la_carta_a_garcia.pdf
    • http://diresudavu.rf.gd/best_light_novels_for_beginners.pdf
    • https://s3.amazonaws.com/lorifawuvawot/apocalyptica_nothing_else_matters_cello_sheet_music.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_48f731bf144240de8dea571668af59a0.pdf?index=true
    • http://tenisofirurefed.rf.gd/muxarelotusekufobikawatu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c5.bin
30fa0e90b8cd69b231aeb3aa68639cce3f88bc3939005a10f5b17f84e4c27573
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 4788 bytes
font_01_sfnt_off00010717.bin
ef88c1d24eee72e3847581d68ca7a152efd8d0ae2a153156717c5350815d4070
pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 11800 bytes
font_02_sfnt_off00012d84.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 4324 bytes