Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99d15030c365afb…

MALICIOUS

PDF

67.8 KB Created: 2021-01-02 11:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3c269df4294c9d28dc54cf011ca43bf9 SHA-1: 28e2145b0811da0b99df461c3cac349ed13e0332 SHA-256: f99d15030c365afb9ae229f4427459e3fe27e47fdb892b294889321d4e550d8e
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though garbled, suggests a lure related to 'beatles piano sheet music free'. The presence of a malicious redirector and a high ML score indicate a strong likelihood of phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=oh+darling+beatles+piano+sheet+music+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fca92bab1099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fbec8ef6be77.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/06d43ed765.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/0b4aed58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5fc8e29d1b95b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f9ef649268b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fbf66ffe226e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fa4b04b783ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5fa310785eb65.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/7296e189-b981-42bd-91c7-df79e2196b79/75436478652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c647dfbf-9d22-47b2-b2b1-b10d1d342f7c/texas_york_rite_bodies.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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 5736 bytes
SHA-256: ff125f619fcc190c0cd0722a7f8fdab815391af1921155f1f0ea5d85bcdaa580
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10324 bytes
SHA-256: 2c441057afc6f95b6bc436ce95d8eced21e368c15e9e80ef697980d47fbbcb1e

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