Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c52744a72d92d5b…

MALICIOUS

PDF

78.5 KB Created: 2020-12-16 07:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 59ce59b3026f4826d654c1772bec4808 SHA-1: 963a155f3e979b8b78e8896063ce1d4e6fcbb863 SHA-256: 5c52744a72d92d5bf86ba95abdc466d92c932dc50861c38ecef2d860ddbb7112
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://trafffi.ru/123?utm_term=edgar+martin+middle PDF link annotation
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/kudibaripesevomiki.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/4544589.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/1854655.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/zizosepumisese.pdfIn PDF document text
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/6972965.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/0c16ee08-8842-45d5-9673-f198672aef66/spss_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5063e23f-98bd-4191-b7fe-0a3469591176/18998621889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b551ea-c4fb-4f3d-ab55-d2eda2ea52de/27530881878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6d4320-cea1-46bd-ad94-07f56c96fd85/paint_net_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815a3054-59a1-48db-8046-dd3cf967fc69/mepikaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ee945a-f7fa-418e-addc-ad8fa047fa48/26030003693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03104851-a28e-4ad1-98e2-6108a3ca3b8d/52247327762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b853284-5072-4c84-8199-1b6bca0304cd/libros_de_introduccion_al_estudio_del_derecho.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_005_off00010e41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E41 19084 bytes
SHA-256: 185c0f064594badb103e2c55b1bb718ff4ae0042fe936071704e5f64c30c4f85
font_00_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 4924 bytes
SHA-256: a77c4a96449f846cd5e299a52499e62c7f46b095c281befd5ee4fb8c6a824cb7
font_01_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 12180 bytes
SHA-256: fb08852cb838c7ddcc86dfe615a15a3ccd041ad6a134cbc10c0cc749ef60e937

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