Malicious PDF — malware analysis report

Static analysis result for SHA-256 155136bd4b8870b2…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 01:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 612741fc51f04590e405b8e313d35715 SHA-1: 3015648f72c6febe96ef4a98d838e7234d6cab92 SHA-256: 155136bd4b8870b20837efa0dbbc83ae09e153aa9f04f1574a20e8d7378f86f1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary links directs to 'https://jacksth.ru/wb?keyword=best%20website%20er%20online%20free', suggesting a lure for users interested in web services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the structure points to an attempt to drive traffic to external sites.

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
  • 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://jacksth.ru/wb?keyword=best%20website%20er%20online%20free PDF link annotation
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/2b7bcb.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/3ee627b17.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/7004617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5ff1d03fa8641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_600aa7892240f.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/5270530.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/radexemajugub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_6013b57c73f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_6018e1f8cfeab.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/3319007.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/3093412.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/vukujidor/xetufopa.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/mobile_app_template_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/burl_ives_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/yield_curve_recession.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/98835824525.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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 4832 bytes
SHA-256: 990b544bc7b894fd68722923fabe305374ef48d337a8159f15baf984cb1f732b
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10148 bytes
SHA-256: 700612c700e7072b270077cac7af3f51fcaa3741dd12c6540c13fa878f75ae9f

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