Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c1fc0294bfab60…

MALICIOUS

PDF

85.7 KB Created: 2021-03-16 13:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a77063a23c34f39f5eba6a4cd1ac39 SHA-1: 4eca2cfb83c1976e120a51fd8c9cb84a49d252bc SHA-256: 93c1fc0294bfab6070dd626f78ca6b90668bef4e86e7faf84246caa2929a7e10
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are presented as search results for books, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and 'PDF_SUSPICIOUS_LINK_LURE' highlights invisible links pointing to suspicious domains like 'com-login8.xyz'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/award?keyword=autobiography+of+a+yogi+by+paramahansa+yogananda+pdf
    • http://everydayy.fun/goteluxotoxorabapowjk2u5.pdf
    • http://onlinesos.tech/pitobogeraludiqlit9.pdf
    • http://lovelyhouse.online/unicode_converter_freezwrr4.pdf
    • http://com-login8.xyz/invitation_to_board_meeting_template50b48.pdf
    • http://mushygushysayings.com/anlet_roots_blower_maintenance_manualuay1q.pdf
    • http://oficialshoes.site/ashrae_handbook_2016_free_downloadvkgi5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bipepezuwed/pakaweridivemot.pdf
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_175fc8dd09c9468c909318264d54b9c5.pdf?index=true
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_07792319ee884bcba0f047c5756c49e6.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_b8422cd6bc0f49a1bc98c25157505775.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_5c29091a00a74e30b0c4815ceeb53432.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_a134cd9ffa1b48199b955a50436bfa98.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_099a324ed9fc420eaa9e39b69d47083c.pdf?index=true
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_d96996ef5a2b4bffbd7aa36552b3559c.pdf?index=true
    • https://s3.amazonaws.com/nojemi/badshah_movie_full_hd_song.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_0ee4eb7a1f8c4bce8dc88b7d33e53286.pdf?index=true
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_41cc9794dcfd42cba4551ec67c755d7c.pdf?index=true
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_d77bb2792d4a4922b23a755c141784a4.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_738bc750388d4ab3868079b13464a258.pdf?index=true
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_dbd12abb7d574d42b8686b80e7eb816c.pdf?index=true
    • https://s3.amazonaws.com/rudelazifizuvo/brche_krzen_erweitern_aufgaben.pdf
    • 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_off0001118f.bin
c1b0a0591d33137486cb46e3f9927b5ec9f7d08bc5ef5ce86bd84da98ac62f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 5652 bytes
font_01_sfnt_off000124a3.bin
5c5d32b02d8cb1873fc0a95bb37da018aa6595330bf97c433fa5816250d59509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 10620 bytes

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