Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b0463dd8ef312b…

MALICIOUS

PDF

66.6 KB Created: 2020-12-24 21:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e85a3198760eb02202fa2d62d892ecf8 SHA-1: ebf72c5e4982df7f2df97b44cda29072eff0f737 SHA-256: 24b0463dd8ef312b28c62df9c1a0747dc41fec8b8f3491d7d75c264726204c97
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious intent, likely phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=elcometer+270+datasheet PDF link annotation
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/44fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5fb2bb54816d7.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/8954199.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/toruzobigebu-zusoviw-pexuj-tekajegobef.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/kevufanakesadipexaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fd70df3d8e6e.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/khjjcpH/51401054651.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/5883804.pdfIn PDF document text
    • https://ridulajevu.weebly.com/uploads/1/3/4/3/134352946/2030384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fe41013e1466.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/xidulumexi/8502448442.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/97640814792.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/32597177980.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/robafo.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/bikewapewupoxewisesonex.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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 5488 bytes
SHA-256: 60671a075fba07706d00f31bff216eb968a1a0048d26f006a07edfa6887d406b
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 11308 bytes
SHA-256: cee919f1bd43ef7466bf6e1be4971da1ff82c1230f723b997da4e50902d216d9

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