Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca57de6859c2c002…

MALICIOUS

PDF

78.1 KB Created: 2020-12-09 08:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 524d1ee8dc930df98436d045851c3d33 SHA-1: 9b33d32ced438095547b6159975e54025f0d2683 SHA-256: ca57de6859c2c0025166aaa5ffe716ac82d1334676b56bd8aaeb916b3672473a
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 0.9995

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://trafffe.ru/strik?utm_term=miel+de+agave PDF link annotation
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/gexojeraxuvozuz-lujasotasiluj-tejakafisuzojax.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/xipavir/dallas_park_elementary_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/desufubisasenaxikefutini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8343ab1f-0394-4e46-b70b-6ab469e26795/mazuzojukomig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba69567-9da9-4de8-a4bc-758b2880314d/pezudomaduzel.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/ana_rodriguez_artist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcdd22c-c553-4d5e-8530-dfd9cc6317c3/99696144198.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/tautomeric_form_of_cytosine_pairs_with.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c399b3-e888-4b42-8490-7b5ee65636f2/54534741196.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13e7dd49dd12447366960/t/5fc2b874173fb5383bfccd08/1606596725232/48641143122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb71822d-fc8c-4f96-a92b-9d10ec8075bb/brashier_middle_college_calendar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 4784 bytes
SHA-256: c75f54e9065f1d68f3d38e8a6acd9df54e38eab16295230d31c45e4009030ee4
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 4776 bytes
SHA-256: 04d8fa2ca763fed12eedf7aa638f6d1807727b2e80a2bdbbc375677109efbc56
font_02_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 11916 bytes
SHA-256: a26c151548e50e77385a31da8f1837fe1e6ba81cba490074da27bfda61de0abd
font_03_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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