Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9ee5785e59da52…

MALICIOUS

PDF

67.9 KB Created: 2021-03-05 19:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ca18f6813ce382158b038c62eea8e2d SHA-1: d6b02c85a3051449b5335c4d7cbe9dba2bf58c2b SHA-256: ec9ee5785e59da524fe42cc83ca24bab2bf54885d78d1b8aee1a58d4dbf5e08c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=conjunctions+worksheet+5th+grade+pdf PDF link annotation
    • https://cdn.sqhk.co/juvebuzizej/aienpjj/anagram_solver_scrabble_words_with_friends.pdfIn PDF document text
    • http://koolmaxt.online/issa_case_study_selina_kyle9lzdn.pdfIn PDF document text
    • http://doucheapp.xyz/goodbye_to_goodbye_sinopsisle94y.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/jfgg9hd/ninjas_stolen_scrolls_unlimited_money.pdfIn PDF document text
    • http://koolmaxt.online/titugaruzowunakobadilulimhafr.pdfIn PDF document text
    • http://biomanix.best/sharing_a_web_page_on_facebookpi479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fe6b5a209482.pdfIn PDF document text
    • http://leoidet.xyz/luzotawinibexudukiloparern4liy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_601004d2f1ab1.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/d1d6c50b-6578-4398-82f8-fd658819c47a/21574876977.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_2bec9b5e8de8403184b2d4381ce285f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/116cd73d-bace-41ec-a600-93da02e22b61/computer_hardware_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/bangla_font_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/how_to_read_architect_scale_1_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4212e12f-7e07-42c6-8935-3fcb644fbb83/heywood_internal_combustion_engine_fundamentals_second_edition.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_b49515b10cd34223a7f368f8f27fabb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/divergence_theorem_cylindrical_coordinates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41dde52c-cf14-4ad2-8764-948b13af9f52/laxokikitumarepibenixup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2711a267-d041-4f00-b071-50c6175331a4/43618112134.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b6990cded6d744a490f0745f392573e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/hangman_game_ppt_template.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 5648 bytes
SHA-256: 2e4a47468bc306b0154cbee979ad800db2545bfd9d716cb50db8476f5131a69f
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 9956 bytes
SHA-256: a813c8d2be354e4e49ecae887c2ac06142070f93f7ea216dd15458dbc18a84cc

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