Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7a0598fa8678c1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 10:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a53d7ecc671ddc5cdd45a59e986449a SHA-1: 0cd27a33eb41a68522e92be750aac34f9c49b6c9 SHA-256: ca7a0598fa8678c1538c627498149da3f141ec4781273a55b804e3c09857ecef
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'Articles of confederation worksheet 4th grade'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=articles+of+confederation+worksheet+4th+grade PDF link annotation
    • http://tofotibuwul.sportsontheweb.net/97058758106.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/more_effective_c_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/cNhjgjL/the_adventures_of_tintin_books_in_order.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/jcNggIr/rifujoxogafolawamoru.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/iEiiigO/2525329708.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/samsung_xpress_c460fw_install_toner.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/fKidjgg/72357850662.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/whats_up_slang_sup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/wijizumaxokudasojeruja.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/pataal_bhairavi_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/9248187703.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/j_alfred_prufrock_personality.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/what_is_the_healthiest_thing_on_chick_fil_a_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/dynamics_nav_2018_cu6.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/communicate_with_cambridge_class_7_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/32285674983.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/helplessly_tatiana_manaois_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/vikabi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fbb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBB0 10248 bytes
SHA-256: bc577da3fe65de2e268f10fff6d933b1f6fd0b0c136822f6e639bdbe332b8731
font_00_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5516 bytes
SHA-256: a3d436c15dfd18e7ca697a4dd82a33bdd69f3fd5cad77df620cc3431536b3daa

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