Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bd028a00e6e92a…

MALICIOUS

PDF

83.8 KB Created: 2021-03-17 22:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 061868d548f8dfd483b8b3f0689b61b0 SHA-1: 8c60763b21d3ee127194788ba74473c41bc62a65 SHA-256: 43bd028a00e6e92a8b491c0b3e237a8ef48f429aef3a193d75c4dbbe0a6aa335
216 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ML classifier and ClamAV detection, indicating malicious intent. The document's content, though heavily obfuscated, suggests a lure for sensitive information like recovery phrases or private keys. The presence of numerous external links, including one to 'kuzutuzo.ru', further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kuzutuzo.ru/award?keyword=pinzamiento+oportuno+del+cordon+umbilical+pdf PDF link annotation
    • http://reduslimitalia-official.site/bilangan_prima_kurang_dari_205hi48.pdfIn PDF document text
    • http://rodina38.ru/dsssb_answer_key_2_175jr18.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/does_every_cards_against_humanity_have_a_secret_cardy3fkr.pdfIn PDF document text
    • http://lasns.fun/les_diffrents_complments_circonstanciels35ws7.pdfIn PDF document text
    • http://love-your-lips.online/phantom_forces_price_guideo62el.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_cbfa2f089f3f4e9ba576af09f845d2ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/bilonukusufakilarivu.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/bose_sounddock_series_iii_power_cord.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/94581505213.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/wukis.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/lukotutupusilujovoben.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/51340770000.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/84472489395.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c196fe220ff24146b4addf07802768e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be25cb5-94bf-4f17-a85d-241441380e16/international_usps_tracking_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/good_good_father_sheet_music_piano_free.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/97564129242.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/gorazozav.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/best_stock_to_buy_under_10_cents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3267d06d-ad68-4802-b5be-eae0398d4029/monsieur_ibrahim_e_i_fiori_del_corano_film_completo.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_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 5316 bytes
SHA-256: 0c0ed4665982644952725a2b3b60bd97ef7cea7c594c4a2ab22319358027a2f7
font_01_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 12128 bytes
SHA-256: 57d1adcec9db2f7120bf5ba392da4d06fe05ff9bee57462474f544304e9ffe3d

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