Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4fde86a3aee932…

MALICIOUS

PDF

80.2 KB Created: 2021-03-30 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3a584fbf102ee0be30b78e7d0c4d21 SHA-1: a5743873cc50e02df4482baa25665323a427908d SHA-256: cf4fde86a3aee93260d9601ff5ed639f7d8f36966f51ab2a989c81aca617d5d5
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_URI heuristic pointing to 'nipisod.ru' and a 'SE_DOWNLOAD_BUTTON' heuristic suggests a phishing or social engineering attack. The document body, though heavily corrupted, contains text that appears to be a lure for a movie download, further supporting the phishing attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=the+bfg+movie++in+tamil+dubbed
    • https://cdn.sqhk.co/minofavazu/Tx4giRS/best_photo_editor_for_android_free.pdf
    • http://lnstagramcopyrightmanagement.com/how_to_write_a_feminist_critiquejx1r6.pdf
    • https://cdn.sqhk.co/pamezuravuno/XlhihbO/venugedaliwidosevaje.pdf
    • https://cdn.sqhk.co/xejadukoxeta/vUje8jg/bus_simulator_ultimate_longest_route.pdf
    • https://cdn.sqhk.co/lajoroteb/zjiLwRY/gemosugobimukuwexulol.pdf
    • http://mydenverneighborhoods.com/what_are_the_best_jobs_for_infj_personality_types48mkw.pdf
    • https://cdn.sqhk.co/pikuworano/4jajfgE/word_search_puzzle_generator_algorithm.pdf
    • https://cdn.sqhk.co/dazanukisafa/Djdqiet/rassemblement_scout.pdf
    • http://world-wildshop.com/ipg_carmaker_crack1nct4.pdf
    • https://cdn.sqhk.co/zetanitanedo/KgiPZzE/62411117837.pdf
    • https://cdn.sqhk.co/jutafegobexe/ifnUibr/spirit_halloween_animatronics_2019.pdf
    • https://cdn.sqhk.co/bufutoje/fd6libs/super_bob_s_world_jump_run_apk.pdf
    • https://cdn.sqhk.co/rusobotakox/k9zihhf/toca_life_city_apk_data.pdf
    • http://ompala.store/73182325300bl0mr.pdf
    • http://gprofights.ru/tiduvupuralopokilibiwipedl3aqx.pdf
    • https://cdn.sqhk.co/sidamebo/kgfhahj/68007132830.pdf
    • http://ryursew.space/hd_wallpaper_love_birds_photosa5dj6.pdf
    • http://reduslim-italy.site/461381851689j4o5.pdf
    • http://appletopshop.ru/csgo_commands_for_1v19n941.pdf
    • https://cdn.sqhk.co/sawapevodef/ihi2Rig/land_air_sea_warfare_rts_mod.pdf
    • http://bestita.space/8211227711789xts.pdf
    • https://cdn.sqhk.co/marixefe/uEzjbjh/trainheroic_app_free.pdf
    • https://cdn.sqhk.co/tefozakozup/GiaRpDN/48167539866.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
stream_003_off0000eb08.bin
65586e2b80a9297b46a48baf20b2a80030d69725c223f7d04658e8e40b2214de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB08 13812 bytes
font_00_sfnt_off0000d977.bin
c141bb4a3cbeff1b3e2eb576daa8b4ec47589b13ac6d09594964eeb62c41a662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 5196 bytes
font_02_sfnt_off00010d04.bin
5baa39c27e7b0321a36d3c7b425d69b284928f80fa82d1b9315945387a7abb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 11080 bytes

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