Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff8e1ca8cafb1af…

MALICIOUS

PDF

81.9 KB Created: 2021-03-02 15:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bce974586b50f636f253a243ac4b572 SHA-1: 416242b4be49a9875e18b57dc195ee7f363aba20 SHA-256: 3ff8e1ca8cafb1af73c94ebbf1f0759bb8a4053b6d4db5f902188f3b8d44bb5a
96 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains keywords suggesting a lure related to 'Chaos knights 40k codex pdf vk', likely intended to entice users to click the embedded 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://dafemum.ru/123?utm_term=chaos+knights+40k+codex+pdf+vk
    • http://lebedugipul.mywebcommunity.org/roderegumuwefexasabig.pdf
    • http://makilevemifaw.iblogger.org/51015777003.pdf
    • https://cdn.sqhk.co/sepufaziru/Qicjthh/98987951308.pdf
    • http://giwitijudaleka.mygamesonline.org/zofolapubupisi.pdf
    • http://firejowetawo.iblogger.org/which_book_is_best_for_ethics_integrity_and_aptitude_for_upsc.pdf
    • http://deluwotitawugo.iblogger.org/handwritten_cursive_font_free.pdf
    • http://dunodipike.sportsontheweb.net/nogalu.pdf
    • http://tepugorotewole.medianewsonline.com/alan_watts_wisdom_of_insecurity_book.pdf
    • https://cdn.sqhk.co/bujasugawo/AjfhhbF/video_editor_app_download_for_mac.pdf
    • http://golixudib.mypressonline.com/the_rime_of_the_ancient_mariner_very_short_summary.pdf
    • http://figimumagoko.mygamesonline.org/72400232838.pdf
    • http://birebap.scienceontheweb.net/fodmap_food_list_harvard.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vipuzala.myartsonline.com/58956840863.pdf
    • http://nerokigonone.rf.gd/what_legendary_pokemon_are_available_in_ultra_sun.pdf
    • http://sodapatuvunivuj.epizy.com/wordscapes_uncrossed_cheat_sheet.pdf
    • http://zudupaxub.myartsonline.com/do_ikea_have_king_beds.pdf
    • http://gedamodeges.epizy.com/psx_emulator_windows_7_64_bit.pdf
    • http://mivajodeki.epizy.com/how_long_to_bake_sweet_potatoes_at_400_in_foil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin
fb18c52c3591226b9ddc47acca9533df02dd47a67a4b337e4c5d5e91d1f7a629
pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5520 bytes
font_01_sfnt_off00010646.bin
2cb002a2dff55cabe8fe254a40bfad627bd18e7a51bcf674595609b33d53b116
pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 11556 bytes
font_02_sfnt_off00012c20.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 4324 bytes