Malicious PDF — malware analysis report

Static analysis result for SHA-256 c353f115614713a4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-25 21:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ffdaa4adde1d3596c7785d988f444f8 SHA-1: 7b3817fec7a5d941e28653d52664adf2ee9b7b74 SHA-256: c353f115614713a41a9ad057dd9d345c0180d65d1903aa038508b47c887b0729
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme, potentially to host phishing content or distribute further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to numerous external URLs.

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://jacksth.ru/award?keyword=appsc+model+papers+pdf PDF link annotation
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/towawikorezif.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/fbd7d50a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5ff0ea6e617ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_604f35669500c.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/fuzurofa.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/1d7e887927.pdfIn PDF document text
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/9813101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6012e76312cce.pdfIn PDF document text
    • https://jaduxopedarev.weebly.com/uploads/1/3/4/7/134749363/pisidope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_5fca424020441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447647/normal_5ff1be759a784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fcd656e95a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5fc59090e848a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_601bb5f991e1d.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/276153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_600eb7df74979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_602824cc1dcf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_60252825c3a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5ff29800575f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_602cf0a52b06f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_94bd27b4cdf54fe4accaa1a0e0814934.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_c583c72ac88042d88a721da76e52eca9.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_a996b42d581a4907afeb8871497ff4ee.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_fc7e77a3d9b64b9eae1789d97ca5d2f7.pdf?index=trueIn 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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5288 bytes
SHA-256: 908c7c863016a0eaf5dd284ad172841439c697eba30e9ea24b65d2cfbf7a7454
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 11704 bytes
SHA-256: 25a6c76a101e56f986dddd16e2c2174bc92bbd45b7746ff4f4892f874a64a3c8