Malicious PDF — malware analysis report

Static analysis result for SHA-256 785b2aee06877719…

MALICIOUS

PDF

82.9 KB Created: 2021-04-07 23:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 121ae13736241ae1ed091373316d4ff4 SHA-1: c2b582c3ecb10905d2800e1a7a2f01c9d31ef41a SHA-256: 785b2aee068777194e1ce79d7208f8dcd61784d2294ef8f379485954f80c53e2
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 0.9996

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://xezojetit.ru/123?utm_term=3rd+grade+human+body+worksheets+pdf PDF link annotation
    • https://zibalezenakex.weebly.com/uploads/1/3/4/3/134372387/863ff.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/c0e68e56a4bf5.pdfIn PDF document text
    • http://chempion.coffee/sopa_de_letras_para_imprimir_niosjnnev.pdfIn PDF document text
    • http://makamar.online/descriptive_and_limiting_adjectives_worksheet_for_grade_3kog1m.pdfIn PDF document text
    • http://mishabelle.ru/badesivchnj.pdfIn PDF document text
    • http://infonewstravel.com/ham_radio_general_study_guideks4vg.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://s3.amazonaws.com/tutasujal/bexavakizobuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/is_prayer_good_for_mental_health.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/how_much_is_a_kirby_sentria_vacuum_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/chipmunks_on_16_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8459e90c-be13-479e-a9be-d99920778514/will_cyberpunk_2077_be_fixed_on_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2c63a1-f843-43d7-b113-af7ee7014702/ladewod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb13d1-30a8-4e7e-96d0-22286e0c0179/61376068006.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_dcf2b763f77c439d8db03cc3ab16859f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2edb43-89c3-4a17-a9ae-60787ba97833/effective_communication_skills_for_nurses_ppt.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_391d5c9d925740d591074f2568482e20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83ca792-6259-47a6-9d86-af2ad1ad8fae/bakalumegojinawuxojaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91854226-42c7-41d4-a792-dd579d559e8c/28294065588.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_3ffa00a99f8341a0890dacc4ba20eec5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cf6e8f-bc25-499b-9d40-1d0ac093e147/zakitokevel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2c0691-d290-4ee4-bd01-92a180270950/rodixudevuretet.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5724 bytes
SHA-256: 84e8fe5f9c51c4cdd631d8192b6ab0e6430fb62cf18ca467e0d60011babdf70d
font_01_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 10828 bytes
SHA-256: ce560bed81b7e8365b33d014dad9770d11fbb74166f7d5fedbe5b2366d67a00f
font_02_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333