Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a24b4478acc4cf…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 10:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4678505087d2e37932231c4b243dcf8 SHA-1: 99c6185dc19b65950f6e7892c08e490967dcf008 SHA-256: 39a24b4478acc4cf77bfc74d17f0a43db524ff5db94d58ae2eaab860c340b8f9
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'mezovuduw.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to academic worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=trig+sum+and+difference+formulas+worksheet
    • https://cdn-cms.f-static.net/uploads/4454999/normal_602e4ff93b618.pdf
    • http://sefobadivura.iblogger.org/tojewibezosuvinewo.pdf
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/judok.pdf
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fee86b1f372a.pdf
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5ff7748f5cc49.pdf
    • http://copytoshka.ru/tom_clancys_the_division_2_pc_gameplayusfz1.pdf
    • http://jefozogez.66ghz.com/xirirejaborixim.pdf
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/zenusu.pdf
    • http://cparta.moscow/5412843455569pas.pdf
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5ffccfcc1271b.pdf
    • http://mimijavobos.iblogger.org/xebalodosavijofigat.pdf
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fe4e2e487ab7.pdf
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/2a241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ludakijawiku.rf.gd/61764394396.pdf
    • http://tiwadelir.rf.gd/91656875032.pdf
    • https://s3.amazonaws.com/legenapi/android_rooted_device_apps.pdf
    • http://pinamagowejut.epizy.com/hangout_app_for_mac.pdf
    • http://dizoleline.epizy.com/how_to_get_certified_as_a_veterinary_assistant.pdf
    • http://figaniver.epizy.com/88079305662.pdf
    • https://s3.amazonaws.com/vobuturinivi/bendix_king_maintenance_manuals.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_off0000dbb4.bin
a7cfea5a1ace69fcf7e8e5ab041b106b2119ce22fcbbf9c5511c0c6185459689
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 5540 bytes
font_01_sfnt_off0000ee77.bin
eec84efd2f6aad3f8b06e8c3f562f8d85f220dff3e20673ae2017fcf235abe45
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10816 bytes
font_02_sfnt_off000112f5.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 16060 bytes