Malicious PDF — malware analysis report

Static analysis result for SHA-256 774644ba9b745a4b…

MALICIOUS

PDF

90.5 KB Created: 2021-04-07 22:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f49e45616b8eaa5b3ec4fceead1eef0 SHA-1: b4dbca0eed98f0d664199ad66d6b502e52b458bb SHA-256: 774644ba9b745a4ba33930799ee196c13e67bd20c59750b9d89c4ffb56b9699a
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=adventist+youth+songs+free
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/7398331.pdf
    • http://kigalasabipigo.medianewsonline.com/bibobevep.pdf
    • https://cdn.sqhk.co/nakizenonetu/heabghh/pi_music_player_pro_apk_2020.pdf
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/2579063.pdf
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/6095859.pdf
    • http://bonifacy.site/python_list_remove_element_in_loop2nrl1.pdf
    • http://tiriruno.sportsontheweb.net/piccadilly_line_map.pdf
    • http://xaraxag.mypressonline.com/cabinet_mission_plan_1946_in_urdu.pdf
    • http://wotodusasesode.iblogger.org/95765420228.pdf
    • http://rofavaxob.iblogger.org/boss_monster_playmat.pdf
    • https://cdn.sqhk.co/mizogujuzo/gdij11j/namevaxopenipoberobafakuv.pdf
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/c5b12dbd.pdf
    • https://cdn.sqhk.co/toromerepowa/gfcU4ia/90384596294.pdf
    • http://moviesaddaa.online/bengals_injury_report_week_12tdl2t.pdf
    • https://pafotelune.weebly.com/uploads/1/3/4/5/134588297/0a86f9339de.pdf
    • http://nigemutekilum.mypressonline.com/xisimipusebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rixevozajixezos/tupak.pdf
    • https://s3.amazonaws.com/palevijuj/grundfos_mq3-45_spec_sheet.pdf
    • http://tijuvewoduga.onlinewebshop.net/circular_motion_notes_class_11.pdf
    • http://womoxonuzeb.epizy.com/laminated_object_manufacturing_process.pdf
    • https://s3.amazonaws.com/tadevewuju/36596399396.pdf
    • https://s3.amazonaws.com/zonebon/94654564654.pdf
    • http://xulaxun.rf.gd/battlefield_1_online_crack.pdf
    • https://s3.amazonaws.com/wipotegadodorek/gopro_hero_5_user_guide.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_off00012902.bin
3eb66cf26a61cc4c4d37f98c729c1c6c47e5b6aab15ce3014ee76e2333e0574f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 5080 bytes
font_01_sfnt_off00013a57.bin
4e07b00d6a1f3744bfc7717a9bbf4c0b2de7020dff7c8ec478aa6867f5bdb2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 10108 bytes