Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc88eb1f3296684…

MALICIOUS

PDF

70.9 KB Created: 2021-03-29 20:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281e38a3c784b6d4166f7d73418c72ce SHA-1: 1413c3ee3c3e096ad3044bfbe1650b9eec23c100 SHA-256: 9dc88eb1f32966844682a36babb2dfce58739cb0c3e7a42f5d96c7caadc818b7
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, flagged by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=antigone+pdf+scene+3
    • https://cdn.sqhk.co/kunimanujage/hdhbngh/vw_golf_gti_0-_100_km_h.pdf
    • http://retenenu.iblogger.org/plan_de_gestion_del_alcance_de_un_proyecto.pdf
    • http://my-favshopd.online/big_time_rush_paralyzed_downloady0tp7.pdf
    • http://lukezelulevuf.22web.org/buwewukupumisowelunaviba.pdf
    • https://cdn.sqhk.co/zerurukoraju/T5gi17J/horizon_your_portable_glass_cockpit.pdf
    • https://cdn.sqhk.co/navififoro/0Hgcggb/rufosupoduzazarud.pdf
    • http://muxadar.22web.org/sajafi.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/406509604432pkh1.pdf
    • http://bedating.online/37371265341k6y6q.pdf
    • https://cdn.sqhk.co/redugagezi/sCijigi/firefox_esr_60._7._2.pdf
    • http://sepibuzare.22web.org/rawl_bolt_drilling_sizes_guide.pdf
    • https://cdn.sqhk.co/foropogajag/P0fgejc/76765755110.pdf
    • https://cdn.sqhk.co/linewebozid/nAHnjac/11486008893.pdf
    • https://cdn.sqhk.co/giripiponi/iqWGCt6/17731442068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sosozodazu.epizy.com/jaxarimanofup.pdf
    • https://s3.amazonaws.com/jedobufudajewu/nosore.pdf
    • https://s3.amazonaws.com/kudufigunabi/good_morning_photos_with_quotes.pdf
    • http://dowirefe.rf.gd/86600220203.pdf
    • http://fikikozazilut.rf.gd/adding_fractions_using_number_lines_worksheets.pdf
    • http://malanawojuko.epizy.com/46780379324.pdf
    • https://s3.amazonaws.com/sulasatevirexo/accentuate_the_negative_answers_investigation_2.pdf
    • http://kakofuwogo.epizy.com/samsung_6_series_tv_70_inch.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e150.bin
6551e12decf9f7040ab8ea9535cb6862b65d7ed62fe4bc8f44460e0f86cb4690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 5136 bytes
font_01_sfnt_off0000f2f6.bin
ef05e6672719bfc3396f03825c9177129e206070010ba1edcbc184e1ffa39473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 9992 bytes

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