Malicious PDF — malware analysis report

Static analysis result for SHA-256 7469e57613865f38…

MALICIOUS

PDF

89.7 KB Created: 2021-03-25 05:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26271b1582935c134d83600a488f9bb4 SHA-1: 4497604d9bb738f689aeb9bb81245f791a2c40be SHA-256: 7469e57613865f38190f8e9a2d2560655af1721c410aeb9277a7c4bb23e2ea1e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm or phishing lure. The embedded URLs, such as 'https://nipisod.ru/aws?utm_term=pathfinder+mummy%2527s+mask+player%2527s+guide' and 'http://nakotigolajeg.scienceontheweb.net/67578727898.pdf', suggest an attempt to redirect users to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection and potential credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=pathfinder+mummy%2527s+mask+player%2527s+guide
    • http://nakotigolajeg.scienceontheweb.net/67578727898.pdf
    • https://cdn.sqhk.co/binuwaxe/hhcRqgj/html_form_email_validation_pattern.pdf
    • http://kipokefurur.mygamesonline.org/concierto_de_aranjuez_score.pdf
    • https://cdn.sqhk.co/tiwumixe/djcjaha/91669507677.pdf
    • http://xijivedijimidip.mygamesonline.org/41362971704.pdf
    • https://cdn.sqhk.co/lekuruzomef/szDijjf/peweruva.pdf
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/lafokogivu.pdf
    • https://cdn.sqhk.co/wimedizi/eQgfjje/bomb_transport_3d_apk.pdf
    • https://cdn.sqhk.co/jixavome/fiiySjg/xesonuka.pdf
    • https://cdn.sqhk.co/loxepafigav/knTOheI/tenudolidifijasore.pdf
    • https://cdn.sqhk.co/mixasuwekov/nWhcifR/galaxy_attack_alien_shooter_mod_apk_hack.pdf
    • https://cdn.sqhk.co/sadirurafixi/igifOat/invasion_of_the_body_snatchers_1978_full_movie.pdf
    • https://cdn.sqhk.co/kovixileta/ihchfu1/getty_images_free_search.pdf
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/9615087.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f9d6700056e743bd85c9fc54aa18a8d4.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_3fc5633a349344448bf7da3818323c18.pdf?index=true
    • https://s3.amazonaws.com/vukujidor/lowegazexuvafojuper.pdf
    • https://s3.amazonaws.com/jimugivos/allan_kardec_livro_dos_espiritos.pdf
    • https://s3.amazonaws.com/liguwubore/20594477550.pdf
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_25dd5e33639142ad9e9c928a00853e18.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_1fb4af79365746a4b5a4d89a9330ca7f.pdf?index=true
    • 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_off00011b9f.bin
088c22677bcb8e79d2fc6a86d314831a826adfcb171c9fb4fb52febdf1d759d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 5656 bytes
font_01_sfnt_off00012ecf.bin
e5c597719c4f6b797c98e9695864adfbb2cb8d5504059e971c24125ed79c66bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 12212 bytes

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