Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a8138c7173f24d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 23:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb33b9a9ad3dc59f2090f79467763948 SHA-1: 8176f0b1eeed3c6dfaadbf0e2cb7cee28fff1fa7 SHA-256: f3a8138c7173f24d05978820d45abfeaedf8cdb654536a2d047d0a8f84b43949
96 Risk Score

Malware Insights

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

The sample is a PDF file that contains an embedded URL pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to chemical equations, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=balanceamento+de+equa%25C3%25A7%25C3%25B5es+quimicas+exerc%25C3%25ADcios+pdf
    • https://cdn.sqhk.co/kasigabuzu/Ghiiegb/reravugimibonipevoge.pdf
    • https://cdn.sqhk.co/wisulekekij/55gggfk/potubaresikuzedidafifod.pdf
    • https://cdn.sqhk.co/raxinosi/iigvghi/bedoxujuvekonefag.pdf
    • https://cdn.sqhk.co/zimopaji/lggTgeP/pulowumarosizufonedi.pdf
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fd12a5516b65.pdf
    • https://cdn.sqhk.co/putizimetiwe/iegdeF2/hello_neighbour_game_for_ps4.pdf
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5ff7f3d6e1ec4.pdf
    • https://cdn.sqhk.co/dikapagoloza/tG79gg4/social_media_marketing_udemy_free_download.pdf
    • https://cdn.sqhk.co/noneniwetav/cjiJN8O/75722979320.pdf
    • https://cdn-cms.f-static.net/uploads/4483856/normal_603689cba58c1.pdf
    • https://cdn.sqhk.co/wokinuge/7sNjcja/buputukovax.pdf
    • https://cdn.sqhk.co/jojikoxazew/iShbhbc/vobirunadixujabuzuxow.pdf
    • https://cdn-cms.f-static.net/uploads/4530990/normal_60633417eb967.pdf
    • https://cdn.sqhk.co/vemetafije/fSLgvhd/download_game_zombie_diary_mod_apk_android_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b00e4cf6-bad8-43e4-b4ef-59a0aeb20cfa/describing_motion_verbally_with_distance_and_displacement_answers.pdf
    • https://uploads.strikinglycdn.com/files/483ef944-7886-4317-9a78-493097069a99/91497095462.pdf
    • https://uploads.strikinglycdn.com/files/d481d55f-8e35-4aa7-9d1b-a97bdbf6df4d/mindless_eating_by_dr._brian_wansink.pdf
    • https://uploads.strikinglycdn.com/files/ad01f0b5-594b-47c3-80c2-a02b4fd52bfe/bosch_nexxt_500_series_dryer_manual.pdf
    • https://uploads.strikinglycdn.com/files/1dc9f8d8-c26a-46ae-abb5-9337cb8d6ab2/wevuzegujosizavafezerusu.pdf
    • https://uploads.strikinglycdn.com/files/7329db02-e667-4d93-b56c-06340b76dc2f/juwudujubadupir.pdf
    • https://s3.amazonaws.com/daraniwekamidir/53771784957.pdf
    • https://uploads.strikinglycdn.com/files/ab780a7e-9650-40ae-9597-f7b46c13739d/how_to_find_estimated_mean_from_frequency_table.pdf
    • https://s3.amazonaws.com/falevi/amma_songs_in_masstamilan.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_off0000f180.bin
d943586071a9f9b767d6205f2a1a8911e8b5bc8c623ef1f5e0466aa3ee1f0b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 6000 bytes
font_01_sfnt_off00010556.bin
66054356f406241132266570bb89ea2d837fc9a9fdf64776ae7534009b1ddb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 12912 bytes

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