Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b66db6273432db…

MALICIOUS

PDF

66.7 KB Created: 2020-11-29 23:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0e1ea14a64308fcfcdbccdb708a80c90 SHA-1: 8fb238222047f4c01c8ac4a4822a7c147dff14ab SHA-256: 41b66db6273432dbfe57c42177bb44021ac4a6e7831b4a2c046d3d512af8b115
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 0.9997

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=spatial+verbs+asl PDF link annotation
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/1301117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f9073734ffe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5fbef919d6a21.pdfIn PDF document text
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/volapisunipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8f63c690d91.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3787819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f9ea421e5d7d.pdfIn PDF document text
    • https://wilujogid.weebly.com/uploads/1/3/4/3/134347442/gusegozerikefilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f87184e9b190.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/fe1f4ddc-9253-4c36-9aad-56b625365197/gisepukesotivuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b50724-45f8-4b09-bea5-f75f0244883b/sevagubas.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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 5116 bytes
SHA-256: aa8bb1cd20868a55eef907f3fc35096b873458c607f720f33d088bfaca5ecc9b
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10804 bytes
SHA-256: ec9a9b1a76a48da8a94d97cd584ab9a13e97ebb93aba8f06821a4f94e7406ab9