Malicious PDF — malware analysis report

Static analysis result for SHA-256 491cdbafbcf28fa6…

MALICIOUS

PDF

91.7 KB Created: 2020-12-23 03:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64f7b016fd13f80f4315e79ad2b73b50 SHA-1: 9dd1972943c56b09ff4c45d32010f80400395f80 SHA-256: 491cdbafbcf28fa6ef12f925cb47c34c8510edf4f44dc5c464f3537dddeeff23
214 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=hwayugi+season+2+chapter+2 In PDF document text
    • https://jurosoke.weebly.com/uploads/1/3/4/5/134529251/gaguwatomujiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_5fb721a1596f2.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/3025179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5f96ffe3c2050.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/903f91a90ff62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444856/normal_5fe163b30594d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5fa7f1828354d.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/zerepuzuze/62870023526.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79a0c81da8a590db17e0b/t/5fd662e10f11661d4c2bc490/1607885539795/credit_limit_worksheet_2441.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/fulokonobizerusilejezi.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/befadodepo.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/50103179765.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3aad26ff1194f72fc70/t/5fc26aa7f3de5e49b5b29f78/1606576808087/tufirumagexokipu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/android_symbol_name.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_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 7508 bytes
SHA-256: 774c1a58ed4c98f04bf0f4872e2e3f09fcf7c5ccc87e0397e3c778f850912851
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 5452 bytes
SHA-256: 2161a2b69b21260ae7c91160462821b45c427844e05d9f223e1ef9df85d3418f
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 11056 bytes
SHA-256: b9a243cc5c0700fb9b796a8102c945779df45da77f2c779b687edbd0b1b6797e
font_03_sfnt_off00014c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C53 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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