Malicious PDF — malware analysis report

Static analysis result for SHA-256 4638dbec31bd1947…

MALICIOUS

PDF

68.0 KB Created: 2020-11-24 15:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6228f68fc9208588aa475c6082ea90af SHA-1: 97b4b349143730724c60bc9bd456eff391b7c7e1 SHA-256: 4638dbec31bd194742b4c195b427bbe75f421a32c90bfd8baf7062cac7df5cd4
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://trafficel.ru/123?utm_term=the+strength+of+the+wolf+is+the+pack+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5fb5ce1ad51f2.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f91456cc4921.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/af3357cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_5fa14385cb404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fa02c75c8503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5fa8e9e61d239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_5fad91cfdd524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5f94c94f1930e.pdfIn PDF document text
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/vuwadomogowesanetaw.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/wegemebufojafak/roblox_gift_card_codes_2020_unused_no_human_verification.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/84704721876.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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 5524 bytes
SHA-256: c8d2e12db667fa30b670c0ee6a586e20715e07b6f6aade9a71730283b4c1efd1
font_01_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 10644 bytes
SHA-256: ae01f782b15ac5cc15892e041641a7be4afbf3125190ec501edffa2d1bfba3f4