Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b01f5de1050396…

MALICIOUS

PDF

81.8 KB Created: 2021-06-07 22:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc620a39bbf3f6cece59a3307a284234 SHA-1: 6fe235ef5e17f631303be8e241b1f86ac9d641e0 SHA-256: d3b01f5de1050396e5be505e43340a5ead3be82084cd50860477242db0db5b0d
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 pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

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://kuzutuzo.ru/123?utm_term=lease+agreement+template+florida
    • https://tisizapotiw.weebly.com/uploads/1/3/0/7/130776245/kejilov_nosun.pdf
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fce1023f0605.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_605ee6b62d94d.pdf
    • https://static.s123-cdn-static.com/uploads/4403428/normal_60021b0a52fc3.pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_60464aab84764.pdf
    • https://cdn-cms.f-static.net/uploads/4488316/normal_601709282145b.pdf
    • https://bizugejukuvav.weebly.com/uploads/1/3/4/3/134322279/10ded6.pdf
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/lolag.pdf
    • https://static.s123-cdn-static.com/uploads/4380076/normal_60016c1a33d03.pdf
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/3e8c2dfb.pdf
    • https://cdn-cms.f-static.net/uploads/4468553/normal_605909951fbe6.pdf
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/wafapulilafixawefabe.pdf
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fc6ac2583631.pdf
    • https://cdn-cms.f-static.net/uploads/4475985/normal_606433d48e250.pdf
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/4730194.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_600bf39a4cb27.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_600aeb21d6630.pdf
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5ff0281b631cd.pdf
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fda09e6b6622.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca5.bin
0e36bcf6557b7c28cf9bfe930a78981df1c95d33507a4f0103ab80c42367c7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5300 bytes
font_01_sfnt_off0000fe99.bin
b42046a5264f1a4e5e25eb6342aa2fe144f8c93fdc6f7ac1d69bc7e0d0ea8b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10964 bytes
font_02_sfnt_off0001241d.bin
fe462348a3283ca826d1c74360514b1a44fa72f8d7de840ade1c045e8a9ed457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16128 bytes

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