Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a400559cb8a327…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 13:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc5a82f7858ebb2d11f820e805e9596 SHA-1: 2f1e2459424df855a72fc5f59a7c5341937f1495 SHA-256: 09a400559cb8a3275b016c993e222576352e800b3e72c3f220b6ec42d0222aee
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'zajinet.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely designed to trick the user into downloading a payload or submitting credentials.

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://zajinet.ru/award?keyword=machu+picchu+history+pdf
    • https://cdn.sqhk.co/tudenireso/5GmSifC/66577931717.pdf
    • http://dusikazo.mypressonline.com/rekunoliw.pdf
    • http://sevowina.medianewsonline.com/arabic_malayalam_dictionary_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5fd949269aaa9.pdf
    • http://wugegifa.getenjoyment.net/tonojawa.pdf
    • https://cdn.sqhk.co/dolitife/jiEgfhe/75415583746.pdf
    • http://fanutoragozogow.sportsontheweb.net/hayward_pool_chlorinator_wrench.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6054e03daf838.pdf
    • https://cdn.sqhk.co/fefowofuk/efdie3t/19543372334.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fdc66293687e.pdf
    • https://cdn-cms.f-static.net/uploads/4467979/normal_6056448ae9994.pdf
    • http://pozesex.iblogger.org/check_browser_history_on_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lowuwofuxali/19925072582.pdf
    • http://gulavofi.epizy.com/char_broil_big_easy_owners_manual.pdf
    • http://rakixufemagotut.atwebpages.com/blockchain_explication.pdf
    • https://s3.amazonaws.com/bagisi/the_giver_chapter_14-16.pdf
    • http://wirileso.epizy.com/suxibudewapudawuxume.pdf
    • https://s3.amazonaws.com/sefiwegegagu/hollywood_movies_in_tamilrockers._net.pdf
    • https://s3.amazonaws.com/wejuvono/18296173064.pdf
    • https://s3.amazonaws.com/kakekojezutok/nexebudo.pdf
    • http://vimozav.epizy.com/61336102834.pdf
    • https://s3.amazonaws.com/lorerexeg/jegenutifatipumipapatef.pdf
    • https://s3.amazonaws.com/vipinib/nebixekotebedutiboweselin.pdf
    • http://worubag.epizy.com/principles_of_design_balance_and_alignment.pdf
    • https://s3.amazonaws.com/xufujofaleki/89387018869.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_off0000ff36.bin
a8accf99a9cb464b48c69151730ed58d31651559333c68ec3f95715c5bab9c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 5316 bytes
font_01_sfnt_off00011159.bin
afe501dff2597e8a0a9f79d709bd462da8b4b5cc3f9d4dd075d762704c5fc974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11444 bytes

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