Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cc699b9a9fea70…

MALICIOUS

PDF

71.9 KB Created: 2021-06-13 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 96f25fa782ea875db3945c023b8852db SHA-1: d9a4c7c2775b172fc3d700cb51419e6912769cf4 SHA-256: c2cc699b9a9fea704fbfa8cd138a2ca9e664f3711d92f8c3e2a561b694f8c3c7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. This is strongly indicative of malicious intent, potentially for SEO manipulation or to distribute phishing content. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://wastran.ru/pbw?utm_term=b+ukulele+chord+easy PDF link annotation
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/537244.pdfIn PDF document text
    • https://zufitamel.weebly.com/uploads/1/3/5/3/135349526/bufepoz_noforege_dizowepodoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fe5b41421a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_606dc43597860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5fe99b53ac797.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/xezevefatuvo_paxag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60648e1495a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60108a541117e.pdfIn PDF document text
    • https://seligelota.weebly.com/uploads/1/3/1/4/131453084/91431de70c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_5fd9ae8183a11.pdfIn PDF document text
    • https://zedemozotazodi.weebly.com/uploads/1/3/0/7/130776451/abe66ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60118a2df2be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_6042c5ece28aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_60bdce71293c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_60094dd2bbbfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6049775f51b14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144565848/9625367230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303090c9-64c1-45e7-9c99-105733b18b84/19119968695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75590f1c-c35e-4a2a-b3f3-312767e09bf5/susaxidotuvekumizizusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f93dbd9-3dd6-4b6d-8b45-0ce94cd7cf7c/sikerimujufajuloxidufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340c6989-bb73-4bea-9f84-7a6efccbe6aa/398131872.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/how_to.use_a_forehead_thermometer.pdfIn PDF document text
    • http://demogotujod.pbworks.com/w/file/fetch/144956313/wozepikalabogigewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea35a2b-b08a-4fde-b01d-85d10c6b8522/88068223249.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 5240 bytes
SHA-256: 15a1e3540ad95bb9d8b8109bf9549c0ef9e45f8a6c189cf46abb5ad9b4f3b663
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10108 bytes
SHA-256: 15786992bb73acf6594cba2b956143ee9615d6ee2d102d8b4a1afe39cc625fad