Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ae9c295fa46429…

MALICIOUS

PDF

67.3 KB Created: 2021-03-15 01:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a589aa4c0e15b7542eb9590455f1794 SHA-1: 7015183fc542a741a5d9a8f8de8cecbd81bbec2f SHA-256: a0ae9c295fa464290fc8c23968f447e81996158f90532f25e7c6b4641366d335
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to malicious content. No scripts were extracted, but the PDF structure itself facilitated the inclusion of malicious links.

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://jacksth.ru/strik?utm_term=harman+accentra+parts
    • http://finofubamu.mygamesonline.org/subivirin.pdf
    • http://life-news.tech/40017086263yduye.pdf
    • http://sowopezamiw.medianewsonline.com/25533556990.pdf
    • http://natorg.fun/maxwell_s_equations_in_word_formb04v0.pdf
    • http://gooddevice-online.com/juwudafat3a7.pdf
    • http://jasazotinalol.mygamesonline.org/louise_l._hay_libro_tu_puedes_sanar_tu_vida.pdf
    • http://japancar-sib.ru/best_video_er_for_apple_iphoneyii67.pdf
    • http://znalomstvavip.site/98447836353fb98m.pdf
    • http://xexapitanegis.getenjoyment.net/69946668248.pdf
    • http://ukranews.icu/juraratukapuwugefccynh.pdf
    • http://wotukujis.sportsontheweb.net/company_of_heroes_movie_review.pdf
    • http://pe50off.info/roku_streaming_stick_plus_remote_controlnqcmf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_4329a2e8c30a4720a6e02aba3f4852f0.pdf?index=true
    • https://s3.amazonaws.com/fokapikow/kixunafoginebeloxagujoki.pdf
    • https://s3.amazonaws.com/wudibirewuduto/76560451587.pdf
    • https://s3.amazonaws.com/befarekogol/49715673856.pdf
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_9facb02e2d084adda618f0b89c4aaa45.pdf?index=true
    • https://s3.amazonaws.com/purawuma/creature_quest_beginner_s_guide.pdf
    • http://popofisofol.myartsonline.com/nezumutusoxabig.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_ea1bc4737e324a79993ab391395ca086.pdf?index=true
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_83328e5a6b8e48a08b342b9833d693e2.pdf?index=true
    • http://xumuritikoxuk.myartsonline.com/pdf_watermark_remover_software.pdf
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_ebf221b8d86a4305bceda13daa9c9575.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_off0000ca37.bin
28798ce4ab3eb60eef4ebd33fd473d040abaa9d59d19969f3041072f1b02b25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 5008 bytes
font_01_sfnt_off0000db28.bin
70ca60c8ac1c06950c154bd82cfc0f05008e928963b0f5c816b125ddf618ae2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10972 bytes

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