Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cb3540af15300c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 08:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff868974af8f379d38a7c8d8bafa1511 SHA-1: 115ff795eba3f7684104a4235e8371cd501d555d SHA-256: c6cb3540af15300cb43906c96fab3d4c5471e6ca4d2ae39256009be06b21f5fa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=funny+baby+jeopardy+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/xagaxubibiz/8ibje9t/hybrid_commuter_bikes_for_sale.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/65588549233.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/midoguxezeporinusat.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/kjgjghf/wupikesexinowumux.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/h6iihfc/draw_and_label_a_poster_on_save_trees.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/AXhiITo/10176596886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_402d7960e22a47d9ab8053b8626e56a0.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_d04efe1a5a654559943f55e1e3d2f6ec.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_2850174026d4410c84df39227ce3f235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/6647420303.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_f748eff30d4e4e6e8a8f364039c60333.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_4e8809ec16244799952e60fc59173bdf.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_3c0009f1372e4473b8afb4c80b968671.pdf?index=trueIn PDF document text
    • http://zerowegujij.onlinewebshop.net/63829102615.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/44437163557.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_b24b7cac74934481ad18bfd9db52ea35.pdf?index=trueIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_f08bf16102854ae5ad8b7224f1b40379.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_6e38d29afee8422f9334af2a62d2d9ff.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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 5412 bytes
SHA-256: 98ea922e266186c678e1b05ab7bc7f548494ab880ab1a11fadadee1a4a71c669
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10812 bytes
SHA-256: a9c43a85c213db440a0e0be4da1ce2ff40b3a104632e07fa7138fa3c89c5d9e7

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