Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cd456b2ea0ee14…

MALICIOUS

PDF

63.8 KB Created: 2020-11-11 00:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6e80c0e7ee130694af9ce2447f54357a SHA-1: d0384775da1c1ec609f7ea1bc9b1096ffc2692e8 SHA-256: 71cd456b2ea0ee14272aefec85faf71d72dd34e52ff591483ab11a10c8858295
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://trafftec.ru/123?keyword=rakdos+aggro+edh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f9b949771405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fa7117eb5b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f89d33ad4aa7.pdfIn PDF document text
    • https://wegeduvoxu.weebly.com/uploads/1/3/4/6/134634177/6316303.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/fikesu-lebal.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/84ce4da3-5f70-4882-a3a5-29c8d2a45e62/bibevarapezewizik.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/33393129675.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/vacation_request_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/apk_video_downloader_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/modulo_banjercito_ciudad_juarez.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/51399332994.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_off0000bb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB90 5124 bytes
SHA-256: 638ae2c05c01fe848b430daaa3dbd133c06a22a45d09013f0c4ea2da48423232
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 11140 bytes
SHA-256: 14405065c98ed06cc8ca2a392531cf976a069929737dcd5af942a96f6a69a339