Malicious PDF — malware analysis report

Static analysis result for SHA-256 51506995394b4e87…

MALICIOUS

PDF

67.6 KB Created: 2021-01-19 06:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c160bd9ae0e82b9c8c729c59b9b679a4 SHA-1: d05f025f56e99a84c58bbfc28a84050dae0ea837 SHA-256: 51506995394b4e87a6f8b1563bca50740a146eb5c2fd23de977de3301343ed49
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'maypoin.ru', which is likely intended to host malicious content or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be related to educational worksheets, a common lure for phishing attacks.

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://maypoin.ru/123?utm_term=distributive+property+of+multiplication+worksheets
    • https://cdn.sqhk.co/wodaximewule/aahha53/nintendo_3ds_gold_zelda.pdf
    • https://cdn.sqhk.co/zubuwebofe/hcrAOPP/drone_vs_remote_control_helicopter.pdf
    • https://site-1181110.mozfiles.com/files/1181110/nukaxadikifejewizexipoga.pdf
    • https://cdn.sqhk.co/fokatekox/qgjsjgl/99772351040.pdf
    • https://site-1175326.mozfiles.com/files/1175326/horse_cart_racing_menorca.pdf
    • https://cdn.sqhk.co/lulaxujik/bCRCgjw/dinosaur_world_map_wallpaper.pdf
    • https://site-1175273.mozfiles.com/files/1175273/bft_hydraulic_gate_opener_manual.pdf
    • https://cdn.sqhk.co/joxesinejag/rSjie7T/josinixiwutozetudam.pdf
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fdae11544c3d.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff31d76df581.pdf
    • https://cdn.sqhk.co/ninasodivofi/icja7xb/74520896974.pdf
    • https://cdn.sqhk.co/nalomuxe/0uLhcid/repodukilefosubapibofa.pdf
    • https://site-1174515.mozfiles.com/files/1174515/ninja_blender_cyber_monday_2019.pdf
    • https://site-1174461.mozfiles.com/files/1174461/bumblebee_movie_gen_1_transformers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/meaning_of_segment_reporting.pdf
    • http://sogigadataga.epizy.com/peligonogugez.pdf
    • http://ladorum.epizy.com/blur_background_photo_editor_app_android.pdf
    • https://s3.amazonaws.com/kujesulad/alto_s_adventure_free_apk.pdf
    • http://lokuvutifinulef.rf.gd/lezaranuratodavufubu.pdf
    • http://vuxubeso.rf.gd/chhota_bheem_tamil_movie_2013.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_off0000cc16.bin
c93a9385296d98d58791b6fbee65d06216bdf305ddb0ae15f6f5534d104fe00a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 5712 bytes
font_01_sfnt_off0000df81.bin
b93974afa3362e00fe2444266bf5149e7554526735c42d8febecf004c51e6610
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 9692 bytes