Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ec2171dbd858ad…

MALICIOUS

PDF

75.7 KB Created: 2020-11-26 07:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93b480e934d8d8403b38a438453c4b77 SHA-1: 177dcbf1e2eabdda5a4c241d78643e15e53f67d7 SHA-256: a9ec2171dbd858adf870018199d9ea18e77e6f8daf453286f1d6d3cae945d414
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting and one redirecting to a known malicious domain. The primary purpose appears to be directing users to external, potentially malicious, content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=researches+in+public+space+design+course In PDF document text
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/572d57469a477b.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/bemadinifidux.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/399e00da3c94a.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/2546edfd.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/kaloxawul.pdfIn PDF document text
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/dinuzopemivotirom.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/taxokevajazu_fixos.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/jukorude-ritema.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/47244bb2c1c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f87fce13e5da.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/lojawesike.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/76fa3.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/xanawukijora.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/10650.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/garorowa/direct_object_pronouns_worksheet_spanish.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5484 bytes
SHA-256: 61741cf222bf17db379363f816088ad6512e5209635e88a16ec1b52511c7d72d
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10880 bytes
SHA-256: 60d7cd19c0f90d5361d465e7c5285d99655d85144845a6c2457ac550889881c2

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