Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24cfbd4072cd73…

MALICIOUS

PDF

82.3 KB Created: 2021-03-16 00:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7d68fcf013a18ce47afe25a15d57ec1 SHA-1: 9b2902e4310ebe5d0adb957c088dca5cba5bda13 SHA-256: bb24cfbd4072cd731c3a0115a97e8eae51c366cc3be2497a5ac13922f9692496
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://botokaw.ru/strik?utm_term=fluid+dynamics+physics+ia PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/jhMhfww/permutations_combinations_and_probability_worksheet.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/behavior_modification_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/5z2Y1wJ/acrylic_nail_design_ideas_2019.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/bscic_question.pdfIn PDF document text
    • http://rumepado.mypressonline.com/89619655989.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/dKgi1TX/77374448416.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/9iih0ig/fishing_cube_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xirixepo/galaxy_s10_plus_wallpaper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/contemplated_in_tagalog_means.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_30263357555e46a3a1d2546831e7e78c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6545c0a1-6c27-475d-b647-47207065c08b/kovepuxetu.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/blacks_law_dictionary_free_download.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_dc7733a9c9594c4883bcd4db6dbd9db7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/sample_website_psd_files_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/vanguard_brokerage_account_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebed5599-b0bf-4866-8037-6c5cb04a4f41/rowenta_steam_iron_1800w.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/57791290825.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/lesson_plan_template_for_middle_school_math.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_3b9eba3c9e2f4ebda3ee72c6c5dd19ae.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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 5272 bytes
SHA-256: 1eba5dabbd750e93586a857091348772f343f0dd59c57fa6c71e6dde458274df
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10468 bytes
SHA-256: ca3b15d6af95e697a5a97c0da3c1b1c41b8476a5414cc0de9049c796d8e176c3

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