Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08741277b9b874d…

MALICIOUS

PDF

74.8 KB Created: 2021-02-13 09:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6235414da3b37369a42688337bf2c632 SHA-1: 3bce0f105552df0628a335576bed8bdc4be24137 SHA-256: a08741277b9b874d3db416d6bb830b6812d1fc1c6703e8485bcb5968f691fe62
156 Risk Score

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://leonvi.ru/123?utm_term=suzuki+eiger+400+user+manual PDF link annotation
    • https://cdn.sqhk.co/tutabalero/PlTthgc/66398949451.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/aBifgfd/read_along_books_with_cassette_tapes.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/pamino.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/vumelizow.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/eWjj4ib/icon_clash_nike.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/rogugagatuf/japanese_to_english_dictionary_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/5932105837.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/bukupifesisizir.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/ziluwebaxikotavorodab.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/61614595683.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/vidugozazirolonodofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/mokopirifev.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/27181850251.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/lemerude.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/all_information_about_gst_in_india.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5452 bytes
SHA-256: e4c49d22ebcbb1326dac71e79ca8ce240a1b8e589640193ed9138f7e46fab17a
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10824 bytes
SHA-256: 72c7506dc06384dbad34affdfa4d65dd041fd60215b477689a6cf9c548c29e72

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