Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee31e5794ef1250…

MALICIOUS

PDF

79.5 KB Created: 2021-04-02 00:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f726ab6f2a6ae92e957afc19d05bc31 SHA-1: 8992cd0947bcf270e3eae72333ded91207b6ef66 SHA-256: 5ee31e5794ef12501bc1d33f476bc450e5ecadb3be24a9e94d62cf611fac9c21
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 0.9983

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=kadabra+mc+metamorfose+da+vida PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386618/normal_60353352d5492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6049df0d6073e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5fd807c416534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5feb864920ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_604fbd49c667a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_6005eed7a24c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5ffdafea512e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fda44b9aeedd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6019c69907943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_603d045428b42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_f55b39b478b84058a1e2283ea5405650.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_150fb6739a984574bea137605037296d.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a494fdd1a70d4ac28e7d4dfa48bee76d.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_13c12bda8a284eedabc4d9f8005eb0c9.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_65029d85aeec4764b6ff288cbed9eaaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/simple_small_business_continuity_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/harry_potter_and_the_goblet_of_fire_full_version_game_download_for_pc.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_4cfe5a5a27ee41c897dcc43aabb58b23.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_30e5fd8ed33a40279e764a72a609637d.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_c8c8fa9987494b2aad60cde09a6d2d17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/latest_bootstrap_admin_panel_template_free.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_495031b0c98e41b293e1a5cfee8ce782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/the_trials_of_apollo_book_four_the_tyrants_tomb_weebly.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_391518e2e6cc4d4799b1132eb104fd65.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 4156 bytes
SHA-256: e43308d284d7b8fcf26c868a442e383a8535f95f377007dcaf31f9978826306e
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 4988 bytes
SHA-256: cb6717d89b638dab46d453a62833034cb369ee8398c71579b37f3cc263ea5f06
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 11968 bytes
SHA-256: 557e36a91a6140242d849a81b2bfe9fba9b7a9143948155bd14d94e56302b347
font_03_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176