Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c99927470989d9c…

MALICIOUS

PDF

81.6 KB Created: 2021-03-14 23:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d2fad8eb47ed8bc06691aa45d23ecd31 SHA-1: 448330728f6daef393dcb37d929e6bab460aa961 SHA-256: 6c99927470989d9c4451bedb670e219e716cbb8d633449772545e6512b461fbb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to 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
  • 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://pelibifir.ru/123?utm_term=footprints+without+feet+chapter+4+question+answers PDF link annotation
    • http://jorowijedo.mywebcommunity.org/savofipemikujeraxajemoba.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/togereka.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/ponulugu_gaxodo_letapegepun.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/janezajigulalepev.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/business_intelligence_ebook.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jhgfiiM/child_psychology_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/hbPie61/97644986414.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/mexarolen.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/72478154948.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/8806474b06a70.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/dulurokiboxik.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/hebcSge/57108721764.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/98b62b87-9240-4eb1-943c-ac14dfc6642b/descargar_msica_de_los_caminantes_mp3_gratis.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_118d0fc8c91a46feacc8aaa55e34b3df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a682e473-b8fe-4c15-ae3b-db77d665a63e/how_to_add_transitions_in_premiere.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_2a303e314dbb4b058bb759450a60be9c.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_2d1925dac0614df99e9c29eb46a88d44.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 5212 bytes
SHA-256: 9df720abb860b0da1496e44df717d78846df26739762966b5213f2cb8eae6876
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 11008 bytes
SHA-256: 90f4519bbffb66c6485cefed2c67c2c9760dd9725983f54ac61d7b331d61e2ea
font_02_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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