Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a5b60340d237bf…

MALICIOUS

PDF

66.0 KB Created: 2020-11-14 19:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 70d529c1c2453ed76c46426250f6cbc7 SHA-1: b82f4fe2020c7d652676afdb5601dcc94f19e4a8 SHA-256: b4a5b60340d237bf0cafb81403fca54b177690795ed97c63dff2531d15bd0cb8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external links suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://gettraff.ru/strik?utm_term=the+boy+and+the+apple+tree In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5f96f4e5407fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f94db88ba782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_5fa8bbba211c3.pdfIn PDF document text
    • https://dajetulanew.weebly.com/uploads/1/3/4/3/134309067/5cc3b.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/9664762.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5f98e41b3d4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_5faa60726a3bc.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/xatejemuwerofirol.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/d22f8bae-0859-431d-9bae-8ae0c341609c/61417802858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7605d79-2316-4bc9-859b-e9d2810ab4af/zubugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f0d413-52e9-4bd6-9e45-0fd4838fbefa/14421191253.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/47565547171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99442107-7406-4a5c-9b15-8b1b85bca01b/35172107696.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_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 5060 bytes
SHA-256: b660d133a40592f1ceceef3981386c8a6596cba9673a296f31742b0d3da455b0
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 9740 bytes
SHA-256: 7e08762a2fd4fff99a9a82ee57a2a7e51f4b3ae498acddd28edf2e4c261250a9

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