Malicious PDF — malware analysis report

Static analysis result for SHA-256 374cae5132e54a7e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 02:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f99f59c44036c6f4215c5d3ba438ff2f SHA-1: 2d8f60537dba481ec636473482f9fab20c27bff4 SHA-256: 374cae5132e54a7edec35e1430c7d55526531e9c6fffad1e03ce7ac3afe2fe13
136 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and a machine learning classifier, with heuristics indicating it is an advance-fee scam lure. The document body, though heavily obfuscated, contains keywords related to diagnostic tests and appears to be generated by wkhtmltopdf. The primary IOC is a URL hosted on golowaki.ru, which is likely the destination for the malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://golowaki.ru/award?keyword=diagnostic+tests+for+neurological+disorders+pdf
    • https://cdn.sqhk.co/runetonorox/hfmjgVo/87792796148.pdf
    • https://cdn.sqhk.co/xubupigegi/kMhcgcy/inspirational_stories_for_hospice_workers.pdf
    • http://ruvinowuge.scienceontheweb.net/what_causes_a_ge_washing_machine_not_to_drain.pdf
    • https://cdn.sqhk.co/guxifunuris/gPiigHl/city_train_driver_simulator_2019_hack_mod_apk.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/xawolajepavigaf.pdf
    • https://cdn.sqhk.co/podadoxafa/igj5tic/learn_javascript_online_w3schools.pdf
    • https://cdn.sqhk.co/javukapegami/ihatZjg/hokey_cokey_lockdown.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/095e3a74-a250-4655-89fc-390cb9c85ca6/i_am_free_soul_quotes.pdf
    • https://s3.amazonaws.com/donarepemi/40108771493.pdf
    • https://s3.amazonaws.com/dazuxujepov/twitter_videos_android.pdf
    • https://s3.amazonaws.com/dekogamik/album_gana_audio_song.pdf
    • https://s3.amazonaws.com/divelatoxa/creo_parametric_5._0_free.pdf
    • https://s3.amazonaws.com/papuja/4131337442.pdf
    • https://uploads.strikinglycdn.com/files/33d33f88-19f1-49dc-af9b-d6d0ec2b3ab6/rapizilupimufodakanavav.pdf
    • https://s3.amazonaws.com/mizeteb/fusuka.pdf
    • https://s3.amazonaws.com/dojivewobasuval/what_can_i_put_in_a_personal_development_plan.pdf
    • https://s3.amazonaws.com/fopalew/texas_defensive_driving_course_final_exam_answers.pdf
    • https://s3.amazonaws.com/vuzotisenixava/what_film_is_compatible_with_polaroid_300.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/30375666484.pdf
    • https://s3.amazonaws.com/nilititonawafim/algebraic_expression_worksheets_7th_grade.pdf
    • https://s3.amazonaws.com/xozeb/asperger_2018.pdf
    • https://s3.amazonaws.com/jijari/gujibinusitirodizomizapij.pdf
    • https://uploads.strikinglycdn.com/files/05ce234d-4a8d-4ecf-8138-66ff72a4e9dc/what_is_a_fanatical_mystery_bundle.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_off0000f44f.bin
ea8c991a316bff3a043dfd133a66caf857ef62ad3b414c3f1b60f5aa0c686d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 5320 bytes
font_01_sfnt_off00010684.bin
462951f673ddec59f350161e92694ae28fffcc948594f167d9e9b120b7718a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10932 bytes

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