Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd43300debb637d…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 07:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f744f902b783fbc7a17ae3e29a81730 SHA-1: 0c81d5aa5849bcaae3014827b7289fbc8c6ea86d SHA-256: 8cd43300debb637d4a4a12da1670202f51e41c6f0f55a4545bdf5aa4102453fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://seumenha.ru/strik?utm_term=las+edades+de+lulu+resumen+pelicula', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

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=las+edades+de+lulu+resumen+pelicula PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5ffddbe8b84f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_600eca316bd1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fe14674e91f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_5fdb906b9ea69.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/963da676efdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_600dbf13e32ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602638d4e8570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_602888d4b7d9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_602677329240b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_602b665d12759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_6019b721127c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_602d209a5d389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fe1b868018dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_60089cff51a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fe1d14b64fd6.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/lekelepowo/arduino_wifi_tutorial_android.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/95919323400.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/gupaka.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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5160 bytes
SHA-256: 81205f43cb50f78dd6ad19517cefbd72722b9ccafbba1499320af68f120f370d
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 12372 bytes
SHA-256: ed6194f01b0ccb4432a6d937490b8e84bd5293cba45d15ff2e03eebe9bde15e7

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