Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526d52274515c2a…

MALICIOUS

PDF

66.9 KB Created: 2020-12-06 13:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb9b285cc80e22cc11b68baa4130de6e SHA-1: 98a570865a824b08288d9ec01514f1a278d1ade4 SHA-256: 7526d52274515c2a08b63ec5255523f216ff35df182e1b7f9697fd549e2261fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=monster+park+guide PDF link annotation
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/vitelipaxora_lupowevarokiwel_kinimokuda.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/54888a5e.pdfIn PDF document text
    • https://zuzimarubafa.weebly.com/uploads/1/3/4/7/134712841/02a160.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/267f8673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fcb0257b561b.pdfIn PDF document text
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/gadakakeji.pdfIn PDF document text
    • https://goromezamoko.weebly.com/uploads/1/3/4/7/134753948/7af6063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fc3ed9735802.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/pusin_zajoripifisifet.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/wujumalubusademowumi.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/tanomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f8891890e329.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/355adb6fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fa0cadbaa133.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/7652782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5fc88dbe9ee15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 5164 bytes
SHA-256: 37404ec8dfa5b33bb6d956d672a998c32d3705c8d215f8e61691d26db617a150
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 10172 bytes
SHA-256: e9daf4b6128e3e42b92dc7793117871e47911cded15c0701d0e460971b683924

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