Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ac200517bcbb90…

MALICIOUS

PDF

74.5 KB Created: 2020-11-19 08:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 044bc7ebec22edf461682db11a941908 SHA-1: 150a7dad4fd14fef2d8568d839346db63e6b1ee4 SHA-256: 63ac200517bcbb907b88fd5fa5ebaaf79818fbed3048f8a5df6aed3506b73c82
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=cs+1.6+cd+key+%25C5%259Fifresi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f947693d6fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fa53470adf15.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/fbbe90e6186c571.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/26e628f181c950d.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/mupukesunobaga/lodozukedapod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6ecbfd-1adf-47bf-8ffb-b31c92af4cf3/todugazesoza.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/enlace_metalico_propiedades.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/terrarium_tv_download_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22f2572-2958-41bd-95d3-f99951634345/39453814011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b68f5b-c180-4bcd-8826-cc2099c50581/32188317954.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/2268405450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523d99c7-6a5a-483e-9ef3-674b47e9fc73/49329483729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0247d8dd-a376-4900-8707-4d880be8f115/43113779896.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/puxavo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f688.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF688 21800 bytes
SHA-256: 4ef720e3242de865963161dd2009b535f2759b5f32d1aa3db612dae05c4e393a
font_00_sfnt_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 5332 bytes
SHA-256: bb691558e7bfd5c5c07c8ef3829396eb8763c1f580e13f09e6e498080bcd78ba
font_01_sfnt_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 12756 bytes
SHA-256: 362cf73d2ae4aab6c66ee40077a7acb4b183a91ccfcc56a6e327b59cec1a3682

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