Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c2eda32518e336…

MALICIOUS

PDF

81.5 KB Created: 2021-03-29 09:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 9aa151544aa94735352c45fa0e0a75f0 SHA-1: 1e79eea16cb8cbffd6ab9a06d4bd7059c44e6bd7 SHA-256: 19c2eda32518e336a9adf7887b3724733de2e87a76613574cba80461002eddf4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being a link to a promissory note format. The embedded URL 'https://nipisod.ru/aws?utm_term=what+does+cirrus+clouds+mean' suggests a potential phishing or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and the nature of the links point towards an attempt to redirect users to potentially harmful or deceptive content.

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
  • 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.
  • 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/aws?utm_term=what+does+cirrus+clouds+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6012daaf1489a.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/d8jficQ/charlie_brown_coldplay_sheet_music.pdfIn PDF document text
    • http://najasirovazu.22web.org/26578627943.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/gjhafgg/ferajezajavalipugibotiru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_6006d018a1318.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/gdc5Hji/all_star_wars_alien_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_60571db745274.pdfIn PDF document text
    • https://cdn.sqhk.co/kigezarokoji/egeighf/singer_sewing_machine_antique_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5fd9cdf0e40d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/yijAu5U/home_assistant_integrations_missing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_604eadb62ae0e.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/xukirizugukugi/promissory_note_format_for_loan_india.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/60405735559.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/63483060705.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_5099c56509a8414d8514ab3d908485ed.pdf?index=trueIn PDF document text
    • http://defazuneropex.epizy.com/wonexolulajatolakav.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/biochemistry_mcqs.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sebinamav.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_f6fedb3628a84f53b29cab2b9107ae4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/aec_full_form_in_capacitor.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_29de25cdc4af403cb40cda15e8343e78.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_ec044d79bde741e1879d161e3c220fc3.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_2eee3bbcb95040bd8e09ea670ace1421.pdf?index=trueIn 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_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 5192 bytes
SHA-256: 0843bf5f6271f5ee33a847fc6ae4bfb2ea53ad1c947e53e0d882f358a735165a
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10816 bytes
SHA-256: 5e8419edc8741000f76ee08090080490a61b4dc76ebffca0a0c7452d67dc69c4

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