Malicious PDF — malware analysis report

Static analysis result for SHA-256 780557144ae80b96…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 11:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a52d5b1c296a2452c9c6a7c596a9920 SHA-1: f2dd7487a127ed570ff8c9abe520c3459c928854 SHA-256: 780557144ae80b968901a148867b677c5be68a6787bb23a363877dc260b92f8a
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://crophysi.ru/123?utm_term=russian+alphabet+worksheet+pdf PDF link annotation
    • http://ninavadilu.22web.org/how_to_wash_biddeford_heated_throw.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/8900227.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/1843037.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/ede7fa1f-94da-47d0-b7f1-403c9dae402f/gevakatufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f42a795-10a5-4d12-9dd8-409d4b122e9b/24524759658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5aab61a-cb47-4f99-ab1c-2353ff996d89/95629615237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748f9e11-c2d2-4977-acc3-1c7c3a1b0dd5/smart_call_keeps_stopping_on_samsung_s9_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c22daa-aed6-47ed-a6bc-abb1b3afb6a0/beginners_guide_to_sketchup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cba19d7-33ec-4e09-b911-cff9b5406a05/purpose_of_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e959ad03-688b-46d6-9b0e-0696821fd84f/simcity_4_deluxe_edition_infinite_money_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26882702-8630-4e69-b911-64733b106dc9/what_is_the_criminal_justice_system_in_australia.pdfIn PDF document text
    • http://lovusado.epizy.com/teologia_biblica_y_sistematica_myer_pearlman_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d7690e-9236-4642-9ba8-51aeb702701f/system_engineering_verification_and_validation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097d3028-ed43-4586-bf32-0636a426441c/64071476344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b43a3ae-1e35-4f9a-8c66-dab91a0c59a4/the_night_manager_movie_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007ae6d6-a934-42bd-947a-b1e4da7b4482/pobalivugoxowujoninabax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b7e154-3de3-46de-9a79-e87ee9689314/36748260036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6b05b9-55da-4046-844c-2d9aba18e4e7/wuxuxigarepusasunoju.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 5432 bytes
SHA-256: 9a13681830550d2a2d6879cdb95ded42347b1eebcd5ad42723535be2853d4465
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 11560 bytes
SHA-256: ec659e3f49acf0173e5bff5d4f7aeaec59b5b0a47f00aa71255289f552cbf3fb
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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