Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e10d29aaf3d1a…

MALICIOUS

PDF

98.6 KB Created: 2021-03-19 20:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b27dfaa69640be1752dd3f4954c7ff0 SHA-1: 858adc23abfe7203d13edd30e1596ed0d9592fc9 SHA-256: 623e10d29aaf3d1a7901d2be54edacc6315dba5d3964bbcd60e4f5a556079518
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 0.9995

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://dafemum.ru/wix?keyword=tales+of+vesperia+arte+list PDF link annotation
    • https://vuloninufe.weebly.com/uploads/1/3/4/0/134012437/8376146.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/mabud_jimojefojin.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/vavejisosesowasobuwu.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/answers_to_interview_questions_for_sales_position.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/simple_present_tense_worksheet_grade_5.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/ea0009f8-c44e-437a-b7b4-56ed8c0a439a/xukavanozaragifi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/what_is_the_best_usb_turntable_to_buy.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/filavuferufuleza.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/vufekimiwetibebilo.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/ib_chemistry_data_booklet_2016_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/zigemimutadegufel.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/dasawotipumukene.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/diocese_of_scranton_abuse_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370cfd93-d61a-46b3-8bcc-b86260cbb173/naxezarof.pdfIn PDF document text
    • http://kumesebupaxat.epizy.com/canon_in_d_piano_and_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/harry_potter_audio_books_in_spanish_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 21060 bytes
SHA-256: 33d5eadc44c961ef887a27b5f9ba6b26adf1171598ce362897556275d1398278
font_01_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 4904 bytes
SHA-256: 20c4823a063231e5144983e4478b59df5cff4a8863c3c6e1f665269e5bb22b23
font_02_sfnt_off00013ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB8 12904 bytes
SHA-256: 64ecc129ee3b6f8301806ce81ca57dd33e76eb89f4ccfbe56d8a96da04de0c7f
font_03_sfnt_off0001674f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674F 16236 bytes
SHA-256: be6f0e39734e5f6016c1f537495b856db70308759d88783df17773c888fee759

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