Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b89eb2fd78149…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 16:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e1de0903ced186cfa7b9adaf458cafd1 SHA-1: f2d4062a258a426506bbe75724fc171b067a4e5b SHA-256: 811b89eb2fd78149c9ca812e2e6658e1a93f2f9f12c03c64c141e7058992c0b1
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://xezojetit.ru/123?utm_term=ncaa+bracket+template+excel PDF link annotation
    • http://wotukujis.sportsontheweb.net/oriflame_products_catalogue.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/1699878.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/40b8848a.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/29262.pdfIn PDF document text
    • http://laulu-go.ru/10754229907geoa9.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/8543092.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/jane_jacobs_book.pdfIn PDF document text
    • http://7gusevshop.space/physical_science_grade_12_november_2018r5y02.pdfIn PDF document text
    • http://helplnstagram-confirm.com/24326366692iemhf.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/park_tool_big_blue_book_of_bicycle_repair_download.pdfIn PDF document text
    • http://podjem2.club/dragon_age_origins_lothering_side_quests9qidr.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/zoromexemuzid/expanding_sentences_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/zuvatojabesifukenopomados.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/zovekaferawabuper.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/free_printable_february_2020_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb6e858-9374-4bdb-b0a8-ae14ecac818a/what_are_examples_of_thermal_conductors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ae6cb4-28b8-4226-913f-d0bd35c0edaf/samsung_ht-j4100_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/17700947554.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/vevatakefamotibori.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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5140 bytes
SHA-256: 1db5737349f70a690fcf3d98e22de691fe7b588e4acd83bd9e89ddb74e643a32
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10776 bytes
SHA-256: a211ac2446866504945381146ae546d69be8264479697a30cc4633414b2bdd2a

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