Malicious PDF — malware analysis report

Static analysis result for SHA-256 9054b82cacb1e343…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 01:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8d7e4d3cf80d9cf883af5849874cae SHA-1: d83356d2a89df862d24bf7f20930aef762c8205e SHA-256: 9054b82cacb1e343089b29551214f627ce67979a2af6b455113993d7e794cb50
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 of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=police+car+games+unblocked
    • http://bajesiradevo.getenjoyment.net/53233402369.pdf
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/4049203.pdf
    • http://jadebey-x.com/lujipuvazisukizopitunalelci3y.pdf
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/ea6f639b90b7b.pdf
    • http://formblckr1.xyz/intimate_apparel_charactersh5cax.pdf
    • https://pebenari.weebly.com/uploads/1/3/4/5/134518206/33bc956b.pdf
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/wuwerogapegomu.pdf
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/makep.pdf
    • http://remastacer.com/android_sdk_location_mac_android_studioqm8t2.pdf
    • http://devicesprotectionforusers.site/chaine_d_nergie_exercice_corrig0lj2u.pdf
    • https://litoxixolemor.weebly.com/uploads/1/3/4/3/134379235/kivigudesijinik.pdf
    • http://bumululoru.mywebcommunity.org/national_geographic_articles.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/b135161c83.pdf
    • http://kinorio5.xyz/pewurinudowerelaabvo1.pdf
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/d351016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fusopoxipo/65451055005.pdf
    • http://bavotuvezomevi.myartsonline.com/how_does_the_farewell_end.pdf
    • https://s3.amazonaws.com/nutanigonu/41800938507.pdf
    • http://dovunufesesiz.onlinewebshop.net/python_gui_programming_cookbook_code.pdf
    • https://s3.amazonaws.com/xoferuzu/99763833023.pdf
    • https://s3.amazonaws.com/bizamesuwepe/70781568997.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_off0000f064.bin
7c8d9a6248841924836ddba8e2654c729ddb29a5d1e096d6abc2462b226cb13c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5464 bytes
font_01_sfnt_off000102e3.bin
0a604881c2bc372cc9f4e92cc61fd4cda5a6e81fa3b9fc6b2128b0f7b1fb9a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 10600 bytes