Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4f60a25d7c3ea6…

MALICIOUS

PDF

77.6 KB Created: 2021-02-23 06:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0f813ef4c25ae0d877625c5c4d3d39cd SHA-1: 8e92751c460b56b2cd10cf0c3240a40451cec1db SHA-256: 3f4f60a25d7c3ea620ac81010813427c85fb61215e0eb604bd557930603863d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to lead users to compromised or malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=modo+de+producci%25C3%25B3n+primitivo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487386/normal_601b2c12569d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6004ff4a0f588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fffdd9509845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_5fda63d4dc1f7.pdfIn PDF document text
    • http://izzzaaa.space/lusadarerisoredak1dwzc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_60044c38e0dd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_5fc875156ab92.pdfIn PDF document text
    • http://catsism.com/borland_c_5._5_compiler_free866bd.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/b90abe14da.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/buwurozepufufom-dekafimajalu-mifemewesav-sewikesorer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_60328117b6cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_600f2103e1df1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5ffdb66bc8f56.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/negunisatadev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5feb25c6c5a3b.pdfIn PDF document text
    • http://badgesverified.com/dunk_and_egg_storiesn3d89.pdfIn PDF document text
    • http://slamelina.website/majafidavakadiwegakmnvb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5feaf17277cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_600c39069ab5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_60038d3ac2f31.pdfIn PDF document text
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/gomegakadelaruto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5084 bytes
SHA-256: 4a64bee56d3daa800c45fd5e950fdc31d3c0a2db2c55be4f0b17e5cd639f9dac
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 11336 bytes
SHA-256: 8eec34902266b58866280b9e1bb64d279959ca9e8020bc36ab42f5dfa0b762b8

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