Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34a0031569d29d7…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 04:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57dd817298aa30b964d1619e0e2bccb4 SHA-1: 2bfc3c92e447db0e8f13f6c36bdbd90eb4f3de50 SHA-256: a34a0031569d29d761dc075b6648d2b212a42619ecca5048affdb25ee02f4c3b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to an attempt to drive traffic to potentially malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=super+mario+63+unblocked+games+76
    • http://trokot-shtorki.online/wordpress_website_development_proposal3lat8.pdf
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/6793838.pdf
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd36a33cba08.pdf
    • https://cdn-cms.f-static.net/uploads/4369773/normal_6025952e24946.pdf
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5ff0d93c0cc31.pdf
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/5733423.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/suvusoxisotidazot.pdf
    • https://cdn-cms.f-static.net/uploads/4489429/normal_6012cbc72719e.pdf
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fdc79ce8f466.pdf
    • https://cdn-cms.f-static.net/uploads/4417675/normal_6015799c323ac.pdf
    • http://thiswaytovogue.com/mejoworusafv99oo.pdf
    • https://cdn-cms.f-static.net/uploads/4403940/normal_601b03b4c39e4.pdf
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d7a38e6752.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://veveliwuw.rf.gd/beaver_uniform_badge_position_uk.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_off0000de6c.bin
498d03975ed573b962f28061511852e71371753b636eac28c8fd9cd8095e2ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 6100 bytes
font_01_sfnt_off0000f313.bin
fbadb1e3568567dc599151c009fdd56a431ce6193e13a5367b3dcbcd4c5d97e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10240 bytes