Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b0a8e9277ada1f…

MALICIOUS

PDF

95.4 KB Created: 2021-09-20 10:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfea78b74b2173ea0d81e86fd600685c SHA-1: dc275bd84d6136031a1d7ffef6632aa71f9ce8e1 SHA-256: 35b0a8e9277ada1f226d1919d132cf7947281f295654127be22502692b99314d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=android+lollipop+easter+egg PDF link annotation
    • http://natalieshuff.com/uploads/file/moguxuposupoxutetili.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/56016429648.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/luxogedoz.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zagupimixavukisuba.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/jodudik.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/mewawixeputup.pdfIn PDF document text
    • http://millecolori.it/images/file/79544172912.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/damomu.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/jofujal.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/jurufoxazigimemewegadura.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e5f54101bfc4c437a14fc9cdbb2488d/91227698619.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/83234478441.pdfIn PDF document text
    • http://geoman.cz/data/file/59543899385.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/fedada.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e483764ee---sukorujibipepe.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/redinigofapumujes.pdfIn PDF document text
    • http://rotang.net/userfiles/file/nexomapebogupewuvar.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/28843535700.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/58239694699.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/vekifobufofizi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/geririsojuz.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/17944373018.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/51976040159.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 17928 bytes
SHA-256: df3d2eee1c90b6d649fdfe5e415ee8816c6c6eb920988d862921812f1b1d20bb
font_02_sfnt_off0001588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588A 10548 bytes
SHA-256: 4d8300247225a21da6e4b85eca24aa9b5bdbb2ba99b3a43514a2ffb8dc213c9b

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