Malicious PDF — malware analysis report

Static analysis result for SHA-256 63aa06d58f561d3b…

MALICIOUS

PDF

81.3 KB Created: 2021-03-22 03:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8fdd7d83dcc10f26b28220cbd26805 SHA-1: 15a4bc496390718e9399c086ffce48e2d077a7d4 SHA-256: 63aa06d58f561d3b887c3f72822f8baa0161f5021be96ea578a95a937c630161
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=movie+maker+online+video+editor+2020+jio+phone
    • https://xajixaze.weebly.com/uploads/1/3/2/3/132302973/8573968.pdf
    • https://cdn.sqhk.co/wibetaxor/dohg6YJ/16575056702.pdf
    • https://cdn.sqhk.co/tiwoxebu/2ZFBjbS/free_pc_games_to_play_2020.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/pudaxazude-liredaga-dupuzi.pdf
    • https://cdn.sqhk.co/tokarikadez/2QlH3ig/drone_controller_board_price.pdf
    • https://cdn.sqhk.co/jenireni/ificbhE/1733756030.pdf
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/nedugorokef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_4815ac3a6c9340919fcf6ca11ca2690d.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_c110648ce642402094845713510d0b40.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_266a6ea2e1c14125971ca5a18806f9b1.pdf?index=true
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_da3fcb7bb5914aad80ec491029a5656e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96331206-b9cb-4c3a-b74a-c2e20b0f885b/samsung_un32h5203af_manual.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c400dedc17174ed9b46c1db9c95d82d8.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_5c13070f984642408e70d8e045d0e2f8.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_b0f08ef2a6c14646895681f3e4151bf7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba6c8951-74c1-4555-bf8e-a11aca9bf4c8/7553411394.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_03353641141c4b78bd96a317fdeef2ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/471a1187-7823-4660-a62c-3cf778c8c58b/panasonic_cordless_phone_service_center_pune.pdf
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_16e0aa5b858649ecbd996aa2d5a201d0.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_32e51536d7174eaea702d2e73a9f4d74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/730039e1-9c95-4846-9189-ca7af6445de9/roku_2500x_release_date.pdf
    • https://uploads.strikinglycdn.com/files/c6f7fc76-bc73-4ba2-8b94-158b8f2d8e5e/how_do_i_start_my_aroma_rice_cooker.pdf
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e4a1ee60642b4af2a9e02086265c03e7.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_off0000fed5.bin
9bf7138e39a684faeff328225f5948beaf8b8d5ecda62bb003395a7b82d7a529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 5500 bytes
font_01_sfnt_off00011171.bin
23d984888647951e2abc1b9f187c934960dbdd1b1d433b8f6c6c5c48d87cab8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 11072 bytes

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