Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f118dc063169240…

MALICIOUS

PDF

149.2 KB Created: 2020-12-17 22:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6783cc3d08266d6bd61b2331768a7a2b SHA-1: 90670a2688792ddd50561c19918418ca2f6540a6 SHA-256: 9f118dc063169240c23d53f9bfbcba2459e201076d0cf53f1561351799862c35
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and Weebly-hosted files, indicating a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://traffnew.ru/123?utm_term=why+did+japan+leave+the+league+of+nations PDF link annotation
    • https://sirefofaf.weebly.com/uploads/1/3/4/5/134523631/d0e8463.pdfIn PDF document text
    • https://tofuxatedev.weebly.com/uploads/1/3/4/7/134706151/borubifop.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/binonefajagunigetelu.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/wigajetakoj_nowisafas_xunorop.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/88b8fa0.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/retus_nivof_rowepezise_dipole.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/jaletonakex.pdfIn PDF document text
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/1178676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a9acd5c5-44a1-40fd-91b1-d0ffbf692c78/uc_mini_download_mobile9.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/67192019403.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/bohr_diagram_and_lewis_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6697a9-e968-4091-9441-f71792d2f45b/act_of_toleration.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/informant_legal_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB2F 5340 bytes
SHA-256: 4598b7b987d02014c74fa3a24b3c8488165b0203728e27f84f34f23a2bd26c0a
font_01_sfnt_off00020d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D7A 14140 bytes
SHA-256: 81c37281b855cf69cabecc02e3bfaec08d1fff1a1b998bc089963c77cd7f6270
font_02_sfnt_off00023906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23906 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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