Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f96ec4e4b391ae3…

MALICIOUS

PDF

127.6 KB Created: 2021-03-27 17:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aa14fc40a10ed3735ed1952f7bb30c4 SHA-1: e4858ef1b4521bba809a52062a357a54b00b4d64 SHA-256: 4f96ec4e4b391ae343c1b58f9fefe68d9a39912c4967063f68bcafda6f63a3ab
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malicious content.

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://jacksth.ru/strik?utm_term=westminster+shorter+catechism+question+33
    • https://cdn.sqhk.co/xanovika/Xhghhgc/combo_list_generator_online.pdf
    • http://eushopvmn.site/what_is_the_meaning_of_the_story_hills_like_white_elephants0gm4a.pdf
    • http://useplafond.xyz/how_old_is_my_tempstar_furnaceate4m.pdf
    • http://prodive.su/20081901034dkjjx.pdf
    • http://forkidsshop.online/walmart_tv_stands_in_store8itg5.pdf
    • http://fuckfrsky.com/24_hole_chromatic_harmonica_lessons8t7kt.pdf
    • http://drovazvenigorod.ru/seeleys_anatomy_and_physiology_12th_edition_apa_citation79iwn.pdf
    • https://cdn.sqhk.co/naziwixolagu/jj4hdha/skulduggery_pleasant_series_amazon.pdf
    • https://cdn.sqhk.co/xixumobun/lgdKh5M/run_run_super_v_apk_mod.pdf
    • http://silver35.ru/what_was_the_significance_of_the_reconstruction_act_of_1867fg2t3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8925f29-62a6-4faf-81d7-8a70cc94d6e8/a_queer_history_of_the_united_states_chapter_summary.pdf
    • https://s3.amazonaws.com/fefurorobumi/jaguduzoxozil.pdf
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_49945af108ce4363b313407d91bd5ea8.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_aa2d9ef41f00493bb7116e057d939f9c.pdf?index=true
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_6da331fe57814f7aaabf0745e9bb79c4.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/descripcion_fisica_de_los_personajes_de_la_metamorfosis.pdf
    • https://uploads.strikinglycdn.com/files/fb2c1cce-f594-4a8d-abf7-c2a7af8ba479/how_to_find_displacement_on_a_velocity_and_time_graph.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_9ff96ff918ee4c6682e56b157e69dd2c.pdf?index=true
    • 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_off0001b692.bin
003657aa643114811623499b2f0d99d45a9620db7c5a99ae321b569992f55106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B692 5312 bytes
font_01_sfnt_off0001c888.bin
bc1431bc1fe2883defc0fef0b4ca730ef5b5b08b55357238e9d1df384e142e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C888 11740 bytes

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