Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3ae17bfb593906…

MALICIOUS

PDF

86.1 KB Created: 2021-04-26 18:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7268a41549561c7ae2e2bac651fc82f1 SHA-1: a004ef9aaf5847c926155e02bb88f0e9e8e850af SHA-256: 1f3ae17bfb5939065906b4c7b3eed4bf4f63cd3daa1b78862bc00c41db7d0453
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The embedded URL points to a suspicious domain, likely intended to host a secondary malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=what+do+communism+socialism+and+capitalism+have+in+common
    • http://amst-watch-v2.club/solving_linear_equations_using_substitution_method_worksheets2o8wk.pdf
    • https://cdn.sqhk.co/rogolafu/cghFHid/atlanta_weather_10_day_wsb.pdf
    • http://naturka.space/bird_paradise_delran_nj4m1xg.pdf
    • http://lnstagramverificationbadge.com/area_of_irregular_shapes_worksheet_7th_gradebe7nt.pdf
    • https://cdn.sqhk.co/nelufebo/Gfhggc7/email_notification_sounds_not_working_iphone.pdf
    • https://cdn.sqhk.co/kedetofido/jajbjeb/fasipotomumidakelezak.pdf
    • http://pukitifafizeba.mywebcommunity.org/lekegelezi.pdf
    • http://pupezawat.scienceontheweb.net/learning_styles.pdf
    • http://luminar2-download.xyz/how_to_pass_your_permit_test_in_tnkwa25.pdf
    • http://pribor-poverka.site/has_anyone_died_from_navy_seal_trainingjxyh6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bcde4a15-910d-4417-b7cc-d9dc6fe4c4fa/garmin_vivosmart_4_manual_uk.pdf
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_ff148a32431e43cb81add16ba06ff36b.pdf?index=true
    • https://s3.amazonaws.com/mejifavo/rv_dinghy_towing_guide_2013.pdf
    • https://uploads.strikinglycdn.com/files/5c6fcba4-3466-43b2-9947-ef11084afebe/36728600300.pdf
    • http://tijuvewoduga.onlinewebshop.net/zebufelis.pdf
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_e0dc9369082a4a778d7329128937d125.pdf?index=true
    • http://vewawisu.onlinewebshop.net/difubudosepir.pdf
    • https://s3.amazonaws.com/nuxulikiwab/digital_marketing_courses_online_google.pdf
    • https://uploads.strikinglycdn.com/files/96115b14-a237-403a-b3b1-1298a5b36c48/jufanuwux.pdf
    • https://uploads.strikinglycdn.com/files/76cf1be9-bf0c-486c-8d0e-d6d9a3cf4b7d/best_diy_face_mask_pattern_with_filter.pdf
    • https://s3.amazonaws.com/tuzakifezara/back_to_work_email_template.pdf
    • https://uploads.strikinglycdn.com/files/fc602fb6-47fa-460a-9016-da0e515251f9/roxamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010571.bin
1faeec52271d3666ef502f53c2655e747c492f7696e6a9e32934aff4c4b7387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 5172 bytes
font_01_sfnt_off000116f5.bin
1cf5497d9dc0ff4016bef7dfb7f4c12e44be10f4c91682e4aebc2bac07e5cf93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 11036 bytes
font_02_sfnt_off00013c98.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 4324 bytes

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