Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9b4d05c3b9fff3…

MALICIOUS

PDF

66.6 KB Created: 2020-11-18 23:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb19dbd7a7c3fc032fa6ef784d24242f SHA-1: 9b37a752b8f53fdd362a5ac176f638f72b600d6b SHA-256: 4e9b4d05c3b9fff37b62660507312d41969647f27e3f697945de688056920215
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-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=clash+of+clans+full+version+free+download+apk PDF link annotation
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/xipil-vamoxetit.pdfIn PDF document text
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/4788060.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/3a329084af89c26.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/bivanud/counter_strike_cheats_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/78450415623.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/nidinuwewisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/wanadikige.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/brentwood_school_uniform_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71baf5f-c56d-425a-91cb-178fcf28c7e8/20030667025.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bapoliwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/simple_machines_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/adenomiosis_uteri_adalah.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_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 5364 bytes
SHA-256: 6f21ba889ded717a921020a8a881cc258fee8893d89aa84a98d540e8697501f5
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 10588 bytes
SHA-256: 7d946254875169e355f6749f9b7a92ea8b1c27b08ee926b859dedef5538f090c