Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4468907a06a99b…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 23:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f6e83e20f23d3dd680a00942d0bc1500 SHA-1: 103c20581615180014e9c52990597db1c1146f10 SHA-256: df4468907a06a99ba0382cf86f28fbd8e4c7a793af91c85e3a353d2094d15857
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/123?utm_term=how+to+test+a+dryer+timer PDF link annotation
    • http://worldhold.online/wafaluwejazskfuj.pdfIn PDF document text
    • http://rankingcoach-apps.com/wafepukenewotudujqw6mx.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/9852236.pdfIn PDF document text
    • http://ufenmac.com/46965768631ijfpd.pdfIn PDF document text
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/xatepuku.pdfIn PDF document text
    • http://paksorond.xyz/68281355542u9xmy.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/tenunud/annual_credit_report_free_transunion.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/bebas_neue-_regular_ttf.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/93973026760.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/66109293234.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/north_penn_reporter_obituaries_lansdale_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/deep_sleep_battery_saver_pro_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/napamusiw.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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5092 bytes
SHA-256: 4911dd21d687f9796847f0cd78a67d82db9864ede2cc55ea22e14396ce77a63f
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10592 bytes
SHA-256: cab7ad976c98d07125b8226e3214891ab9f263b9bfc69cb694e796d538e26bc3

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