Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5e2706c834f05…

MALICIOUS

PDF

64.2 KB Created: 2020-12-23 01:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f2de629025bfbc4e9b6c3af8e342445 SHA-1: 913f95548edddb3c7ddcdd9d00e578838d33a9a2 SHA-256: c5d5e2706c834f05c7047acb8fe19a0a7dfef35351286ceefe774790db496d7d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the document's structure and embedded links are designed to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/aws?utm_term=deleting+cookies+on+chrome+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5fafa232a6133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fab23b415477.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/39d8ae79aca046.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/5714835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fa3682419705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_5fbe89acd4e20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5fc9ac35d9445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f876589ea476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fdb389a5d9c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_5fc2926116b3c.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/8927f16c-b1ed-46a4-8649-b40756a4e1b5/raze_unblocked_games.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 5416 bytes
SHA-256: 04d76655659eff6194fb189246636997ef5d27966f2bab9358e3222e634bcfe7
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10216 bytes
SHA-256: ca021296b8929b103e7fad8b3a560173227007a9f9cf8a8bc0ded66ccd367ff1

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