Malicious PDF — malware analysis report

Static analysis result for SHA-256 f964fd6082530965…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 11:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4d3c365fb038c58dade39d16e3d47e8 SHA-1: 2b8228ec321de97017656ceeb789e6fe9fee2372 SHA-256: f964fd6082530965ba0ddccd7d229cc7f38e4c14ae07a853b3b11d0ce000c37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The primary URL suggests a lure for downloading content, which is a common phishing tactic. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=members+only+vol+4+full+album+download
    • https://cdn.sqhk.co/xawefigi/jjc6gib/demadogepu.pdf
    • http://axecheat8.xyz/how_long_to_heat_hot_dog_buns_in_oven4grvh.pdf
    • https://cdn.sqhk.co/xamowizaso/gd9jajh/21114524846.pdf
    • https://cdn.sqhk.co/nazabimon/hYigyic/9521928009.pdf
    • http://nukels.xyz/dokemudasedija2oy44.pdf
    • https://nexevakef.weebly.com/uploads/1/3/5/3/135327015/zanibiparogaxidimo.pdf
    • http://igme.site/what_is_secret_city_on_netflix_about4uwxj.pdf
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/nuxez.pdf
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/neguse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pafiganovavi/yealink_bluetooth_usb_dongle_bt40_user_guide.pdf
    • https://s3.amazonaws.com/gixirojozogufux/difference_between_thematic_analysis_and_template_analysis.pdf
    • https://s3.amazonaws.com/lekelepowo/bandera_nacional_de_honduras_informacion.pdf
    • https://s3.amazonaws.com/midizaxopazeji/html_form_validation_on_button_click.pdf
    • https://s3.amazonaws.com/lewuli/serial_extraction_case_report.pdf
    • https://s3.amazonaws.com/jeponowon/black_snake_moan_full_movie_hd.pdf
    • https://s3.amazonaws.com/sedowedi/11571292246.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e306.bin
8e84c2c7a70cc491ca915117454cde23705b6b4891f5d5ed46a9e6ddd08de626
pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5540 bytes
font_01_sfnt_off0000f5ec.bin
81c44ddac8180adbe0b612edc3cdcea2138824db55550b15e67e6f1b7afc01dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10332 bytes