Malicious PDF — malware analysis report

Static analysis result for SHA-256 4123040085d7b0f9…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 11:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5199c89f616c597b83570a939f886608 SHA-1: 70aa110037fa91b1069d20e0fc077387453891e8 SHA-256: 4123040085d7b0f9665fa5b70bcb064b08190bc7b1440977a8e092ea3d19adc9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to zajinet.ru, which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational content, specifically 'Newton's 2nd law of motion worksheet answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=newton%2527s+2nd+law+of+motion+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4367645/normal_602afd302df8d.pdf
    • https://cdn.sqhk.co/lazujanaziri/vQhejd4/download_game_stickman_slayer_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60151e4d5b408.pdf
    • https://cdn.sqhk.co/sobexofap/yldEjcc/zamofuzibuxekuxalavixafiw.pdf
    • https://static.s123-cdn-static.com/uploads/4367912/normal_6006f0eaccd62.pdf
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5fe52bf3dccb0.pdf
    • https://cdn-cms.f-static.net/uploads/4469101/normal_6012b12d322ac.pdf
    • https://cdn.sqhk.co/tamikoveken/ibcgi5y/horse_games_for_ps4_vr.pdf
    • https://cdn.sqhk.co/sipebililofo/gf9eqjd/translate_english_name_to_japanese_katakana.pdf
    • http://lnstagramsupportinfo.com/81747789052ckvcd.pdf
    • http://good-production18.site/wuxulud2ac.pdf
    • https://cdn.sqhk.co/musezikuzapi/hjb3hay/coffin_nails_long_ideas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mojivikapeti/best_gift_for_male_boss_farewell.pdf
    • https://s3.amazonaws.com/midizaxopazeji/78065785982.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_dd444beae83d4b4b98c281206898b186.pdf?index=true
    • https://s3.amazonaws.com/resixexi/niferetokuweduvibovifi.pdf
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_528a89eb64434587bc40938aaa555fbd.pdf?index=true
    • https://s3.amazonaws.com/sabobenuwe/chrome_browser_opinion_survey_android.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_c464c77029f04458a81e2111ac7316dc.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_11ecd29170ff41cea3988fdb863e8052.pdf?index=true
    • https://s3.amazonaws.com/megodipewukitoj/polk_psw10_subwoofer_review.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_3df6801c0c424bc9a6485d34565d6803.pdf?index=true
    • 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_off0000e83e.bin
3b4d5864b3b14d32d788e282a33e451220069d1bcc3c1c25d1122f257e9917d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5540 bytes
font_01_sfnt_off0000fb11.bin
1b4cdd23f05622e6d27cd59552acccb9adf69049db98532a0797912b49d33db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 10248 bytes

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