Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f0e590317dac41…

MALICIOUS

PDF

64.4 KB Created: 2021-02-12 01:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1306c43880d98a6481f727a86f18138c SHA-1: d1f9f89dae893d64f37cee1b6baa8280d38f8d02 SHA-256: 36f0e590317dac41aac469698e803801e743c34fad1120f140432383a6907847
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric or generic slugs, indicative of a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites for further exploitation or phishing.

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://druttle.ru/wix?keyword=truth+tables+geometry+worksheet
    • http://kerubidezarido.iblogger.org/68122340551.pdf
    • http://momentshop.space/16065964359nlqs7.pdf
    • http://collegegraduatecentraldating.com/rosikalaxojapujezazelaraj2gqoy.pdf
    • http://help-mediasupport.com/xunigasugogojata6fvfr.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/652088.pdf
    • https://cdn.sqhk.co/janawezexoj/QlCji0p/87984658986.pdf
    • https://cdn.sqhk.co/segevenujuka/fijrZih/harris_jayaraj_movies.pdf
    • http://flymoney.net/fixed_bottom_navigation_bar_android819z6.pdf
    • https://cdn.sqhk.co/mepapogivoma/3iijiYl/change_grid_line_color_matlab.pdf
    • https://cdn.sqhk.co/keridola/gcsShg0/firework_frenzy_basketball_tournament.pdf
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/9209051.pdf
    • https://cdn.sqhk.co/baluwofuk/hfjhhgc/bisinurivezovoxoloz.pdf
    • https://cdn.sqhk.co/pujixefan/id4ibhc/badenejapomagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b463.bin
60f400b3800b38c8ce0ea8455b7fe9d29b94e1a259b9a1b8d8139d9273fae15d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 5176 bytes
font_01_sfnt_off0000c61b.bin
3872a7440674dfa606d9f4c29a21f6c0538c7b84d6f22cce7a9a9ceb6b3e12b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 9676 bytes
font_02_sfnt_off0000e6ed.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 4324 bytes