Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f062b92bdad9dc…

MALICIOUS

PDF

76.6 KB Created: 2020-12-15 01:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5d1a9978a4f5899541b5f809f9d1c822 SHA-1: 9545c3bd3aba6f0d92236aa006adac1d4dc79a7f SHA-256: 78f062b92bdad9dc7a328f310be129851679c098f570809eb58ed472acf91f63
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=life+checklist+buzzfeed In PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/fobivufusogubezutoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5fbb31977427a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5faf43ff09370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5fc28e0522d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f92a05ab8b29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc10aaaf9866f3fd2d521c0/t/5fc2763918e72e5fdb2738cf/1606579770082/pofugotepef.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/xapafifesememuteleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368a377e-bc04-4340-8a5e-4ce4d459c58e/2043001298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac3aadd-f84d-4d9a-8d2d-32a6c6708497/foriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32f0a21-835d-47e0-b5a9-05f3b3ccc5b8/javur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4841e822-a223-4825-8956-1d6c71f33d28/ripuzizikofobopuro.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/topuvolofedivoju.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_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 4996 bytes
SHA-256: 6a9483522d95e6cbc120f108cbea801c40132b3cc703a0f3134ae9a5e42169e7
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 3300 bytes
SHA-256: 48d7b7104ac66414726eb54c9d2bf9e6e0d6a92a986001f8c8401b8bd07a9bbb
font_02_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10408 bytes
SHA-256: bede0864e7419ac3b63b2a8d1f61ca7dcdf5f09de2147d23229acb9375a6228a
font_03_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16512 bytes
SHA-256: 9b35cbe2e4085b086d1b81269a7116302f8febe3dc8de83c2fb7ea9a4ef94b21

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