Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dd28f830768d41…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 13:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976fdba92d8fd8bfe81505a6490dcb6d SHA-1: e420de86fa14c6f5f640a40e06fbfbcd887b6f9a SHA-256: 83dd28f830768d413e0b8db017ef29f85dd323efa2a8e6c3aee6630824010213
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. 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 0.9997

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=joker+the+killing+joke+animated+movie
    • http://atomyimperial.ru/zosanirowoakvni.pdf
    • http://experiment.website/dometic_manual_awning_armsimwdn.pdf
    • http://itdiscount.info/93904530347kmtqt.pdf
    • http://dronextactical.xyz/xavosut8x3rp.pdf
    • http://avto-trokot.xyz/7077669822975aw1.pdf
    • http://odebayitrafikhizmeti.com/dogs_are_better_than_cats_essay_conclusionvfflx.pdf
    • http://jakor.pro/wpf_datagrid_cell_templatev5hpp.pdf
    • http://arthromedshop.xyz/46035778832216of.pdf
    • http://picsonair.com/dofabomoluxawrd7k.pdf
    • http://topplafond.xyz/what_is_micro-expression_recognitionbsaul.pdf
    • http://atomyimperial.ru/azar_grammar_powerpointslw1nm.pdf
    • http://copyrightprivacy.site/suzakivumsa05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_df86d1d5db0b410c9d0b90a55f4418f3.pdf?index=true
    • http://rozatibex.rf.gd/ballay_ballay_full_song.pdf
    • http://fekofenuxekit.rf.gd/what_should_i_paint_my_boyfriend.pdf
    • https://uploads.strikinglycdn.com/files/b48136f3-6f2b-4326-ac84-77a3a0593dad/first_grade_addition_and_subtraction_worksheets.pdf
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_17ceea01b7dc41aca3d71112d15ca3e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f759c54d-4c66-4d6c-84e6-e14abe755689/what_are_the_symptoms_of_moolam.pdf
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_d2a5c24378264fa5b42754324c946310.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49dab72d-0147-4231-afa9-9391d62e72e1/free_python_tutorial_video_series.pdf
    • https://uploads.strikinglycdn.com/files/e81c0e99-8577-48ac-b836-5ae444809610/what_qualifications_do_you_need_to_be_a_safety_engineer.pdf
    • https://uploads.strikinglycdn.com/files/4f052cc6-af79-4da6-8030-9aaf48ac5213/84862543393.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_off0000f385.bin
28452a0220258e7a9dccf6b659d87c5b5ae088b4ea3c937ac976a05d2205b1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5252 bytes
font_01_sfnt_off0001053e.bin
39a6d31f9b5d9e4723c0aaee481ecbc6cb0c050d50ad46623a3ad989e72464bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 11628 bytes

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