Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc5ee5794ecadf3…

MALICIOUS

PDF

61.9 KB Created: 2020-12-18 11:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db6e684e637e6bf1237049f5bb4bfa0a SHA-1: ddb89158daed12a30b9c67c9755d3163d965e8e5 SHA-256: 4cc5ee5794ecadf30b9b6a06b4901dc3fcea19ca43229cdedb73f2b2fcf464c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. The primary purpose appears to be SEO manipulation or the distribution of further malicious content, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=omea+conference+cincinnati PDF link annotation
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/8deedb8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fd678459e0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd2250a75842.pdfIn PDF document text
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/1483166.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/9269183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f9b1c1f41804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_5fac5fa79cadb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fa89aa2391fa.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/1940474.pdfIn PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/766149b5.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/705999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/juwitabesawimufidisakal.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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 4844 bytes
SHA-256: f41458b019c9042ab116a578d8d0b3badee3141898a4387bc56472bf408e17c3
font_01_sfnt_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 11260 bytes
SHA-256: f824e639cd9c4583a2c24fa06cd379bc24f4dd788e4f4a4350f837a5b19c3efb

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