Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ad566b171f6b46…

MALICIOUS

PDF

79.4 KB Created: 2021-02-28 13:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f3cf94c86cece8fa691bbfeac3d328c SHA-1: 7ef706d7a3c3026f0f0d348959912d6dfec6c955 SHA-256: e8ad566b171f6b46c6c2997143387ddb8719f08502adb6c380103504ff2a02a8
104 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability 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 document body, though heavily obfuscated, contains metadata related to PDF generation, further supporting its role as a container for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=mechanical+design+and+systems+handbook+rothbart+pdf
    • http://twenty-promo2020.ru/3721737748156zdj.pdf
    • http://khareedforosh.com/sakabirujascma5k.pdf
    • http://moviesaddaa.online/28473099990lsans.pdf
    • http://opensalon.xyz/4916351997s4jmm.pdf
    • http://lamakexo.scienceontheweb.net/la_la_land_free_movie_online.pdf
    • http://morj.space/jinipisoxabaqcijz.pdf
    • http://mobeditobaxul.scienceontheweb.net/harry_potter_y_el_misterio_del_prncipe_google_docs.pdf
    • https://cdn.sqhk.co/zidenesek/ghegdwx/jekojido.pdf
    • http://gladkoe-telo.xyz/lemerimizefixigivugitojysn4y.pdf
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5ff16b859aff2.pdf
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6016fe1607f68.pdf
    • https://cdn.sqhk.co/kosifodalab/gdIibge/farming_simulator_16_mobile_cheats_ios.pdf
    • https://cdn.sqhk.co/wusoxopejezo/djahiha/28261845242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tevefetilojas.atwebpages.com/goxoxubusowemejuruzil.pdf
    • https://s3.amazonaws.com/vabemavuputenif/backwards_curriculum_design_template.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e147.bin
ee1b20cf2721e1ccb055587e903fec05c47a56fcff1830f0cc29aea07779a482
pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5880 bytes
font_01_sfnt_off0000f530.bin
6d0b9757e1eb4166c5513b6524050f338cff1f80eee0e143a10ef293b87176c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 11212 bytes
font_02_sfnt_off00011ba2.bin
927758a74c7fcf0b6220d25f3bab4a735270d4bd36d3c6eec20f99818168148b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16064 bytes