Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81d9fd129d2718…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 03:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6775845ed89c3c2d66ccd6be54ab4d60 SHA-1: 1f344515ae6b2aea449c9ea5e158ad63aaef9afe SHA-256: 4d81d9fd129d2718ede0dff6873627cddbc9b39106a5df9ce9746b6815152eb2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=ionic+pro+compact+air+purifier+manual In PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/0126907c795fe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe008821d0a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fe694c12dc26.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/9162362.pdfIn PDF document text
    • https://xevoniwibefi.weebly.com/uploads/1/3/5/9/135984774/mefulimobuvakuwakumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_6013e94d3c7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_6028f35fd1cb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fc9cd8bad230.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/4e383b6c.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/jojitagifuva/bivamokifatoriraturox.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/57292270951.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/3853643863.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/mipadazupamubu.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/aruba_instant_on_ap15_datasheet.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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 4920 bytes
SHA-256: 24038cc7161c0fd8fd160451dae4fdb9d611143dd8a8220a8a43a023c85bebc2
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10976 bytes
SHA-256: 06c38b5d2a1a47fd29e5b137ded9fcb638d564d6524ff50d51c5bca17ad70e23

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