Malicious PDF — malware analysis report

Static analysis result for SHA-256 1863b3e6dd633e96…

MALICIOUS

PDF

62.4 KB Created: 2020-11-14 16:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bcfed273d809a7267a8aff2bf028b703 SHA-1: 9473aa17e90bed747d4cbff3e67aa5947055b0a5 SHA-256: 1863b3e6dd633e9652a7be034ac83405d60f88a5bfffb03e6108ba297ad19802
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=beach+roses+for+sale PDF link annotation
    • https://vulagikivup.weebly.com/uploads/1/3/4/2/134234906/9654255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f93351d8b823.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/392721.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/4699356.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/susopuzupure/dakopuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24732b0e-695c-4cdc-a29d-9893e71fe1d4/betaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27320004-2be6-4d7c-965d-87b2a2c02bdc/ubee_dvw32cb_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001b2a6f-5b2a-4959-84e8-3d37169d0527/pojuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/rapovezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bbdf28-e6b1-4e9c-a7d2-042111aa20c4/53538176506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62809857-3034-469e-8a63-c72c639ea849/danerulazidifumuz.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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 5016 bytes
SHA-256: eaec1aefcd1b8e6d5772ca2a851a153426712fd8cc533e89b9bc24d288c24ddd
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10832 bytes
SHA-256: cbcfce44beb0d6157d99f6326f88566664f8235fac4374a212c5b0cc059169c3