Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfda5ec7f54247eb…

MALICIOUS

PDF

84.9 KB Created: 2021-04-29 10:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a362caa4a861d99b27841e905435c55d SHA-1: 76e52cd8d9b7940b211ff862e65decbe22e162c1 SHA-256: cfda5ec7f54247eb907af0964bd93affb0996d473b7b63ab45dc77f73ad146e5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by heuristics and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to the URL. The presence of external URIs and the ML classifier's high confidence score indicate a phishing attempt.

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://xezojetit.ru/strik?utm_term=how+to+connect+two+lnbs+to+one+dish
    • http://remont-kvartir-otzyvy.moscow/english_grammar_exercises_past_tensep1ydc.pdf
    • http://evilcheats.fun/vegetables_indian_list7mldk.pdf
    • https://cdn.sqhk.co/pimibopugugo/o7ijqjf/90073471599.pdf
    • https://cdn.sqhk.co/guvevifowo/jhNKji7/dead_man_down_french_song_lyrics.pdf
    • http://tomogorman.com/drawing_and_painting_classes_for_adults_near_me0ltcp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobito/proforma_invoice_excel_template_free.pdf
    • https://s3.amazonaws.com/bipovoromoj/perguntas_de_casal_quem_se_conhece_mais.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/tomuzefiwizetenamav.pdf
    • https://s3.amazonaws.com/webipejonavuv/how_long_does_facebook_take_to_review_account.pdf
    • https://uploads.strikinglycdn.com/files/2379f963-e8aa-42f6-8574-b517a1060abe/defiant_motion_security_light_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/6cc3161b-9902-422b-80fe-619e1311a6db/halo_bassinest_swivel_sleeper_essentia_series.pdf
    • https://uploads.strikinglycdn.com/files/5dafdf4f-48db-42c4-a73e-c8c56f466e32/vocabulary_activities_for_grade_6.pdf
    • https://s3.amazonaws.com/rovikibixu/lurabevejedopexulok.pdf
    • https://s3.amazonaws.com/gelawiweza/five_night_at_freddys_free_download.pdf
    • https://uploads.strikinglycdn.com/files/9eea65be-cfbe-4c86-93ff-4e84f665a7f8/69861265686.pdf
    • https://s3.amazonaws.com/mefonevimimix/sinopefesuguwegobi.pdf
    • https://s3.amazonaws.com/vipinib/optical_encoder_sensor_datasheet.pdf
    • https://s3.amazonaws.com/kuxuxemu/estrategias_de_aprendizaje_definicion.pdf
    • https://uploads.strikinglycdn.com/files/5c3c8a92-9af6-4fef-a114-65d2ecc256a0/nato_alphabet_g.pdf
    • https://s3.amazonaws.com/musokejixami/nikapomujojikuzeg.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_off00010b3a.bin
f4bb1f5c5e4716e40cd0397431f5356a26258a83c5a9339d3a5b51f4dc4ac54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 4912 bytes
font_01_sfnt_off00011bfa.bin
67ec77ca4469e2af1fb9c3e6fd855cae00a608a9cd7a88150912c482c7f7a22b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 11988 bytes