Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de05b4cd5a8edd2…

MALICIOUS

PDF

36.7 KB Created: 2020-11-09 07:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 441282441b531321a2d3d708a745480c SHA-1: e51816323ad7d5652e833cc2a9d2fcc1f98258b3 SHA-256: 8de05b4cd5a8edd2766c40b39ca43314dec2bd3424cf67c297599a275e2b24d9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm. One prominent external URI points to a URL that appears to be a lure for a 'gilded age webquest answer key'. While no scripts were directly extracted, the PDF structure and the high number of external links suggest an attempt to redirect the user to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/123?keyword=the+gilded+age+webquest+answer+key PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dujexuguv.files.wordpress.com/2020/11/vegusakidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab440afa-57ba-4861-99fa-070a178bc721/62263318571.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/bisijalagopinonedasoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97f56e9-655b-4a93-a742-d301797f73f0/nugirovutajelar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e8205c-0a56-42f0-aa12-68072b67c1d7/blitzen_boogie_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/66846017818.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/499515698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07862db8-5c6a-4edf-892c-6adaea55f91d/40451471101.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/teoria_de_aprendizagem_significativa.pdfIn PDF document text
    • https://gijudusefu.files.wordpress.com/2020/11/electricity_bill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee9bb9b-9843-4af0-9ff9-7ce45061b6c5/88302105666.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/favewenawedutukaviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9d7490-0b29-4810-9254-5ba70ad8f2ca/tripp_trapp_chair_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/tujuwebatalepesuwow.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_off00005019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5019 5560 bytes
SHA-256: 6e0879ab0d86c4f0270c9b9afd0a59f5f007c6a7806b3d6c4e414368622b1c39
font_01_sfnt_off00006305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6305 10292 bytes
SHA-256: 263387bfcb3a038f317555116ced9ae1515e36f53d823d294b401288aff09a5b

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