Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94d280c1ab4d566…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 18:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47f94cbec92b7cbda970367ac49bbd69 SHA-1: 20eb94e4a63676a5d315ed6c12d09b457835cad1 SHA-256: a94d280c1ab4d56605e53d826335ddfee73caf92f6e6aeaa899c1b6bcd12c42c
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'math formula' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=math+formula+all+chapter+pdf
    • https://cdn-cms.f-static.net/uploads/4406223/normal_602d2910db548.pdf
    • https://cdn-cms.f-static.net/uploads/4413457/normal_60637e6603c7d.pdf
    • https://cdn.sqhk.co/kifateten/qhjJJha/xisojufuxowexemo.pdf
    • https://cdn-cms.f-static.net/uploads/4446162/normal_6026288b9e22a.pdf
    • https://cdn.sqhk.co/sisowufabo/ajjPtjg/dozerem.pdf
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5fe34f27bfed9.pdf
    • http://appletopshop.ru/edith_eva_eger_the_choice_review6drqz.pdf
    • http://karaulovlife.site/dell_c1765nfw_fuser9amow.pdf
    • http://fullpisetc.ru/love_yourself_heal_your_life_workbook_by_louise_haym9seh.pdf
    • https://cdn-cms.f-static.net/uploads/4504641/normal_60656ed5ee4e8.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://krokoboko3.xyz/braun_thermoscan_7_irt_6520_prisjaktyb1co.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/senodiw/cheat_sheet_vim.pdf
    • https://s3.amazonaws.com/gumagabu/jedinega.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/fukeviradak.pdf
    • https://s3.amazonaws.com/jazuravazaguz/why_is_my_fridge_not_cool.pdf
    • https://s3.amazonaws.com/xetasif/30327545770.pdf
    • https://s3.amazonaws.com/mukutud/free_offline_puzzle_games_for_pc.pdf
    • https://s3.amazonaws.com/datarofapakil/tizaponaxuwerevovovik.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_off0000e51e.bin
b67fb73cb81bcbf383b8a6d017afd15c2942a31e4fa144f453ced1a790bd3b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 5220 bytes
font_01_sfnt_off0000f6c3.bin
d60bf63fa413ddad928b9ba3eac93f91f86b16be99c6412ac9fcb0791c225e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 11620 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.