Malicious PDF — malware analysis report

Static analysis result for SHA-256 438b52cbd437e823…

MALICIOUS

PDF

62.5 KB Created: 2020-11-10 07:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5e52f86df1b3a68352b374cef3865a80 SHA-1: d5b2c3d87b17842d346ef168316d4fbf3df396a2 SHA-256: 438b52cbd437e823a5d58e5858b879b64dca1e69cef0db1abc945688543167a8
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://trafffe.ru/123?keyword=cpt+manual+professional+edition+pdf PDF link annotation
    • https://kipuzavudikonog.weebly.com/uploads/1/3/4/6/134685368/c28e0cf2cbd39.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jenefemafawal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f8d670cb34d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5f9e6a19c1657.pdfIn PDF document text
    • https://nofawubepugo.weebly.com/uploads/1/3/4/3/134373843/lunesudulam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c93a53a-48e1-4205-b378-f1ee10cb2ff4/26110392038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145bf3ae-1670-4983-a082-a95136b5391c/jopuxipetidelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e604208f-8c16-4dd2-8a51-a513d54ab77e/14015084940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47fbdcb-5364-4895-b8a8-cb893719c5ff/nopawajesazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6284e29b-a451-4d73-83ef-90acf1f31099/fuxizapunosewinaduwukife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8981e0e5-f5ba-4b09-9b72-e2b6bbdfbcbf/der_eisendrache_bow.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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 5092 bytes
SHA-256: 6eef1ccc74a8f1dfc8b3e87dcfa79faefe642ac5c90b4a06c3a11708daef0eb1
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 10272 bytes
SHA-256: 5b199d5e613f416f6fcc73d4bb3e18550b554dda66a999d1a4390a559e570b21