Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f09931c7655d8…

MALICIOUS

PDF

73.7 KB Created: 2021-02-28 01:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ea8f97c4331555f42502bf7b7f199ed2 SHA-1: 4081d607c68ac12d16c471ef19a4cba85a649706 SHA-256: 883f09931c7655d8178f82d2ba6cdf8b855d4c2742f169e1249a3c3a9a44dfe2
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, suggesting it's designed to redirect users to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'management theory and organizational behavior pdf' and the authoring application 'wkhtmltopdf', indicating a potential lure to disguise malicious intent. No scripts were extracted from this sample.

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://nipisod.ru/strik?utm_term=management+theory+and+organizational+behavior+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5fec220578543.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/2177126674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5ff801389fae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_602942c199e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601d9f3b679d0.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/A8jeXos/train_taxi_app_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_602812dc3e066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60124fee53729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5ffc6362a31af.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/SjhUkih/ates_ve_su_oyun_skor_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_60374259d6417.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/besafefaf/english_film_avatar_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/2931699226.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/zutali.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/subject_verb_agreement_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/xelofudib.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/dslr_camera_starter_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/milady_chapter_20_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/21826849217.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
font_00_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 5632 bytes
SHA-256: 7324af9b22e3c0070084e7e9cb3efe710de9320d84212d4be8dcf1b90187bfc2
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 9920 bytes
SHA-256: f09b0cc6845367adff859d2f941e29132c6b7750af6666973053efc3d5b2640f

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