Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f8164817762cdd…

MALICIOUS

PDF

73.1 KB Created: 2021-04-02 14:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8cb5b04b461b2b3d68f5089ce978064 SHA-1: 5304eb2bf424723e051af2ad48e22a1a0d422c52 SHA-256: 89f8164817762cdd40c1679001d2f4befac3f1f4a4e0250fee987a2a8e3d8434
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://lozipotod.ru/123?utm_term=equifax+inquiry+dispute+form PDF link annotation
    • http://tikopariwoxa.mygamesonline.org/topodiwesapikirapafu.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/active_and_passive_voice_exercises_with_answers.pdfIn PDF document text
    • http://lavka-karamel.ru/king_of_the_bingo_game_analysis8ic3r.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/73028747622.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/salunumaxemamudasosixedok.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/jbl_sb400_price_australia.pdfIn PDF document text
    • http://alcexpress3.xyz/state_and_prove_taylors_theorem_in_complex_analysisjsof7.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/53089221743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/englisch_aufgaben_zeiten.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_91dc4f351ec047da881f5bca9314e941.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf55151d-8342-4a6e-af80-e9e100014123/gosevesisemobejezinus.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_961e1fed0f034cc0a908ed9e94e966ff.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_e5f59fe56da64597859569a64ff7364e.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_88fc1fcfa03a43fdb09aea7e50f5ed7c.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/accounting_interview_questions.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_d7510e4d867543ca83acdc7d1b65c2c9.pdf?index=trueIn PDF document text
    • http://misanedajog.myartsonline.com/94511481148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefb4b8c-ec04-4d31-b2bd-8d5cbea3a8e2/62229198988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363f4fed-840f-4155-9ac9-5e856ab50ecf/how_to_draw_a_nose_super_easy.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_4fc2104e215d4ffe8f86058f64132fca.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5408 bytes
SHA-256: 3e0bf42b1608680955e8f64b55b7d398f65b41de61548214e933c40d4995429e
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10428 bytes
SHA-256: 4776564412e285aa92bdbfe9fcd34af72f1093a046c3cccca60ccf859d4ec1f0

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