Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d5c13633ec4b89…

MALICIOUS

PDF

71.4 KB Created: 2021-03-28 04:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11599d50e3f7a653e01b526b4d3d13e5 SHA-1: 53c0aa19eef71d49c1c06d210fd7c7e251e7911c SHA-256: 92d5c13633ec4b8931822d11a30bf3885c0aaa81fc03890fc6624e15ead939ba
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. It contains an embedded URI pointing to 'https://soxebez.ru/wix?keyword=quadratic+inequalities+worksheet+answer+key', which is likely a phishing lure disguised as a worksheet answer key. No scripts were extracted, but the presence of the malicious URL and the document's classification strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/wix?keyword=quadratic+inequalities+worksheet+answer+key
    • https://static.s123-cdn-static.com/uploads/4427781/normal_6001da6db3870.pdf
    • http://magnetfix.store/48250393465m7pjo.pdf
    • http://musc-media.xyz/how_to_upload_portfolio_on_classdojoy4bi9.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_604ae911e3063.pdf
    • http://proita.fun/27766071205mj8po.pdf
    • https://cdn.sqhk.co/libobivole/jf1cSSE/galaxy_alien_shooter_hack_mod_apk.pdf
    • http://kosixanadiguf.iblogger.org/canon_6d_mark_ii_manual_english.pdf
    • http://kaguveka.22web.org/how_to_activate_suddenlink_cable_box.pdf
    • https://cdn.sqhk.co/vimanagadu/bdAgeia/mawap.pdf
    • https://cdn.sqhk.co/jotenitix/pnhahgk/video_tik_tok_kannada_song.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_60431c7416abc.pdf
    • http://podipotekoi.ru/70154351652fxgh3.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_601e65e677841.pdf
    • https://cdn.sqhk.co/kinuneba/f2Pwxs2/9450051047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d17f6837-9fd4-46fb-b623-b629942da7e6/sosemelixumulanavogel.pdf
    • https://uploads.strikinglycdn.com/files/b461bd11-62c4-4b61-989f-1c541071e3ec/strategic_management_final_exam_multiple_choice_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/1e2f2ace-f62c-4c9a-8a4b-75eaaac5e97e/tagizeza.pdf
    • https://uploads.strikinglycdn.com/files/8c66ecbb-1872-44d1-83ac-422b26af19b9/hoover_windtunnel_t-series_bagged_upright_vacuum_cleaner_uh30300.pdf
    • https://uploads.strikinglycdn.com/files/fa034c4a-757c-4e70-bde2-299aba2f90ff/dok_level_3_multiple_choice_questions.pdf
    • https://uploads.strikinglycdn.com/files/5e7af509-a62a-4382-9630-b42309b036a8/fifty_shades_darker_full_movie_filmywap.pdf
    • https://uploads.strikinglycdn.com/files/38a3a40e-ccd4-49a8-a569-381b60cf6af4/what_products_are_made_in_north_america.pdf
    • http://lilufunom.epizy.com/adzan_merdu_nafas_pendek.pdf
    • https://uploads.strikinglycdn.com/files/ef102f10-97d4-4a8f-9c55-cf9a142caa4b/the_door_in_the_wall_full_movie.pdf
    • http://boparozib.rf.gd/best_copper_still_design.pdf
    • http://vemitekagopuga.epizy.com/potewosul.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_off0000d82b.bin
028506c0c7e7457117741dc63dba419e305c15a0236cc6a350fd9963610268f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 5472 bytes
font_01_sfnt_off0000ead4.bin
406cfc3d6fd5c6601581a22d1367844c2fd0079b4e8d20c61f6ae23b5bc57e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10788 bytes

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