Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89032ffbfb32699…

MALICIOUS

PDF

80.8 KB Created: 2021-05-28 06:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5299e30436c27ae925e2b4623008a94 SHA-1: 7cf1df72201ee39814445e4eee904f1b19e8f7f4 SHA-256: a89032ffbfb3269955f4d4a481c0c37037023c19d17b9d9f71f497b0f4d8f1ec
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and a link farm suggests the document is designed to redirect users to malicious sites, likely for credential harvesting or malware download.

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://vilenefex.ru/123?utm_term=installment+sale+contract+template
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/ginixop-robud.pdf
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5ff690a6ecb8b.pdf
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fefbd0ec2709.pdf
    • https://cdn-cms.f-static.net/uploads/4449600/normal_605fa910afecf.pdf
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/feliwoli.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/binorikotimo.pdf
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/5ada0.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600f249e48e7c.pdf
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/e6aad7b.pdf
    • https://cdn-cms.f-static.net/uploads/4406466/normal_604aaffbe6650.pdf
    • https://cdn-cms.f-static.net/uploads/4455639/normal_605cba5a7b6cf.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_600f5a1e7c822.pdf
    • https://static.s123-cdn-static-d.com/uploads/4466657/normal_60afea85d076c.pdf
    • https://cdn-cms.f-static.net/uploads/4368782/normal_6066ef066ac80.pdf
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/8951982.pdf
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5feccfd944e8a.pdf
    • https://cdn-cms.f-static.net/uploads/4451369/normal_604637690c804.pdf
    • https://cdn-cms.f-static.net/uploads/4501989/normal_605c8b1e68efd.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fda8dd7908d0.pdf
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fe5566e2b6ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fe85.bin
f8286ac5cddaf1d03212ccff0e3b748f6cbdaf230843a8975d683391fe0dbf1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 5016 bytes
font_01_sfnt_off00010f7b.bin
1274c66510be73a309f48c0e9a1eaaa9143799249d78a43b33ec01040bbd64cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11264 bytes

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