Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c32118834c10b2…

MALICIOUS

PDF

65.2 KB Created: 2020-11-17 22:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6221237c33938c75789f91f2e3a2769c SHA-1: b13280b6f520e8d4f663f4f696338f622fb67d8b SHA-256: c5c32118834c10b279a15f3ee89d1c8cc1a45fe648f40306de441168a5a2c3da
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://traffnew.ru/123?utm_term=skype+random+chat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fa362dcd82da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fa1173fc0aac.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/puteker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fa6aecd35157.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/soxezikiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8981a8bda1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5fb2a339c0cd0.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/lumixi/guide_post_brackets_for_boat_lift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb055b65-6515-4ea7-ac8f-13d59557451e/safopuvaserusubigos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba96e9e7-1a88-4f19-abb9-6a185b1b2f34/83454496091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8b5d4f-f6f0-4cae-85dd-2f3496e99ae7/lipugefib.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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 5372 bytes
SHA-256: c51fb150a3a022a92caf87b13838d2f88b2b22db1dc28b3491d35a4b8acedd41
font_01_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 10536 bytes
SHA-256: 4bbd478f82cebbe092c907f25a38439f56543bd1e045775f55d3089463791682