Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc70292dfee91063…

MALICIOUS

PDF

73.1 KB Created: 2021-03-04 05:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b186a098d8f5cbad93200b3becfb5e9b SHA-1: 2c6337e8322e79e436324fb157f3cb5333b97a18 SHA-256: dc70292dfee91063e8cfec73601d27bc43f03d28a9312ceae26eb2b1e408d3bf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'gimoguvi.ru/strik', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection as 'Pdf.Phishing.Trojan' and a high ML classifier score confirm malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=the+darkest+minds+2+movie+trailer PDF link annotation
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/3252165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_6002384af179a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ffce5afefb2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5ffe8b1fc9aa0.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/burizifevanesamezotedug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_601e6c6fb2145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5ffb4164919dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd647878d9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd938a0db7f4.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/8613bcbe54a42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_600c8a412f112.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/540469.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/paxunu/59193896267.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/80643594771.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/xujolalezobusuwivudak.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/collagen_face_mask_sheet.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5272 bytes
SHA-256: 7e1d2e4227fe1aefd173b38ccd1da14dc4c01caa20ff6c8c4aaebad5f61a8a03
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 11420 bytes
SHA-256: 1de2a4476c38d8ffd73c793e916348ee04509a90b726b92180879f2f8cc63bd4

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