Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad6978526d18457…

MALICIOUS

PDF

74.2 KB Created: 2021-03-23 09:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94b8cd35de5cc95335c6c2b2eb93bbc SHA-1: 20311431dd026f867bf1d5aebc7fc334b78674c2 SHA-256: fad6978526d18457896ab4bf9063073ea54aa080ad718244b189c3fd5ee46a65
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download button' heuristic suggests the document is designed to trick users into downloading a secondary payload. The primary URL identified is https://nipisod.ru/strik?utm_term=std+8+maths+textbook+ncert+gujarati+medium, which likely serves as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=std+8+maths+textbook+ncert+gujarati+medium
    • https://cdn.sqhk.co/bujasugawo/b5bIJOy/us_armed_forces_enlisted_rank_insignia.pdf
    • http://atomlinux.com/60987836138je9wh.pdf
    • https://cdn-cms.f-static.net/uploads/4460058/normal_6055c1370625e.pdf
    • https://cdn-cms.f-static.net/uploads/4449630/normal_6022e635c86b1.pdf
    • http://metaleagle.ru/how_to_use_moho_occupational_therapyagm47.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_60519400195c1.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fcc6201ea858.pdf
    • https://cdn.sqhk.co/vexedobasof/idDDhhp/mobile_screen_video_recorder_apk_download.pdf
    • http://copyrighthelpcentral.com/2004_honda_shadow_sabre_1100_gas_tankd0f88.pdf
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fc9e11f80cb9.pdf
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fe97db94bba6.pdf
    • https://cdn.sqhk.co/fegadosijete/E1Eefii/rofatatufapage.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6028f8a442300.pdf
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5fc7906b68caa.pdf
    • https://cdn.sqhk.co/xawodoze/aF2ligN/weluxevabepadejozuzufemu.pdf
    • http://50offit.pro/69965933369820np.pdf
    • https://cdn.sqhk.co/nulusezitelo/heUijd6/lol_zed_combo_guide.pdf
    • https://cdn.sqhk.co/vusunuvaka/cDidHhe/gifip.pdf
    • http://deflecfcvy.best/casio_fx-115es_plus_manual24fnq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e2f9.bin
8edfccf6ee75a8ddfb9f779bc63ee891d2485238855fc709e92a6bc8eb7b1de0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5964 bytes
font_01_sfnt_off0000f71c.bin
574107ada5415928ed7b09d7a8ad16254dfce8107925b78e85feecaf56143aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10476 bytes