Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436d612a687f03e…

MALICIOUS

PDF

60.9 KB Created: 2020-11-26 12:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a9c4a806280ef25f1cd0a471646928e SHA-1: 934759c9c6de1e094ed0afb91793b1ed24b8bd08 SHA-256: f436d612a687f03e1e10abe08cf11335f67af9589b58bb29b893265be9cdbb5a
156 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 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=descargar+musica+de+raulin+rodriguez+corazon+con+candado PDF link annotation
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/ligifuvu.pdfIn PDF document text
    • https://sipopupomiva.weebly.com/uploads/1/3/4/3/134307082/vukaxusij.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/3055eac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2102d7-99ac-401f-9fdb-07a6343662b2/8787040172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d53c900-0a89-4fdd-b130-4529b170a668/sketchup_8_pro_components_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd6b075-744d-4173-bb3b-a5041ff694be/loxomeruvaxunoradupelowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a933fc4-d653-4ec6-9429-c2f9769c362c/92764205395.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/envelope_printing_template_wordpad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dad7f2c-fd00-45e9-9761-d364bf7209c7/flat_belly_fix_smoothie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd0a969-a3a4-409a-b006-aefc80b58442/slabtown_traverse_city_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d2f576-94e7-4376-afcc-42abc88cc00b/synonyms_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50084a7-9093-4f69-849d-39d9fff60af6/xumiboraz.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/computer_accounting_with_sage_50_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/acrylic_glass_sheet_for_kitchen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdd6c1e-b260-4dab-853f-e8e9f36bf978/serimixetoso.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA8 5308 bytes
SHA-256: e82ab5a498c347ef705cd915598c15779568898f1706f2a14e67b1623c57865a
font_01_sfnt_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 11472 bytes
SHA-256: 9dfac085370c7bc8ffcfb6ee2f2010956555e65cb3ca742c0f0912d7a01b4587

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