Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f5c90d2dc28801…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 04:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 639760504973878f4c7946344485e2d2 SHA-1: d0278dc8639beb6aab0d7eff2ee75dd579083ad6 SHA-256: 71f5c90d2dc2880189a4f7132f1862e7adf992fc251199816345d2936ea62a6e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic indicating a visual download button and an embedded URI pointing to a URL that redirects to another PDF. ClamAV also detected this file as a phishing trojan. The combination of these factors strongly suggests a phishing attempt designed to trick the user into downloading further malicious content.

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://zajinet.ru/wix?keyword=watch+the+joker+movie+online+streaming
    • https://cdn.sqhk.co/puxedimuwo/jggchgD/48364116748.pdf
    • http://zeropium.com/what_is_the_purpose_of_heated_cpap_tubinggi3u1.pdf
    • http://startask.ru/mutogejolereweludi7iwz.pdf
    • http://gibafafe.22web.org/20493363125.pdf
    • http://organic-ita.space/dudunakefevinqiwy.pdf
    • http://todayit.pro/zolonukuxiwamanaruk8zyqo.pdf
    • https://cdn.sqhk.co/sebuwemid/aumhcia/nojosujulibamilukuxo.pdf
    • http://differencecheats.net/correcting_bad_grammar_worksheetsmu10v.pdf
    • https://cdn.sqhk.co/tenalewi/l7RicL4/zivuzewalubomumujokagu.pdf
    • http://sodalabs.pro/android_one_xiaomi_redmi_note_5adz5x9.pdf
    • http://kipiluzebeguluj.iblogger.org/free_english_grammar_book_level_4.pdf
    • http://tutixiluvik.22web.org/risc_v_assembly_language.pdf
    • https://cdn.sqhk.co/fakodozug/Xogfphb/26243334866.pdf
    • https://cdn.sqhk.co/fusuwudofal/sgjPib1/nalisuziwivavewilani.pdf
    • https://cdn.sqhk.co/zasemewiti/1ifhcoy/pac-_man_geo_release_date.pdf
    • http://cashtanks.fun/how_to_hook_up_a_float_switch_to_a_pumpf7sdh.pdf
    • https://cdn.sqhk.co/wopeporamo/jgejZib/83625477450.pdf
    • https://cdn.sqhk.co/gotoruzud/f2Uiigj/saxusipivogukovobivoripit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ninazarila/39883673206.pdf
    • https://s3.amazonaws.com/tawosutosuxi/kitchenaid_5kpm5ewh_stand_mixer_5_qt_4.8_l_heavy_duty.pdf
    • https://s3.amazonaws.com/garorowa/journey_to_the_west_1986_myanmar_subtitle.pdf
    • http://sodebaxekigefip.rf.gd/zuvotirenu.pdf
    • https://s3.amazonaws.com/pibajuwi/angle_of_elevation_and_depression_worksheet_cont.pdf
    • http://paruwegugu.rf.gd/36360077636.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_off0000f255.bin
57c32b9ec0fe620396d21de286e0ab577a13d687453b452d60a6f475436f3f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5424 bytes
font_01_sfnt_off000104b6.bin
6ad5d2b8ce7c579c3e9d2c79863899b0678921777b11fcd17cf16b44a86e8104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 11832 bytes

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