Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc007fb93a38d81…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 11:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cda6c5938f98e2d35db5dfadefb2ba8e SHA-1: de22edf30e3fca77d843658acaeb0ee6a3dafd7a SHA-256: 3bc007fb93a38d8130d1f1d9e131055beb0f62325ba5f5c7ca72038cce61ff24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links to various domains, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=omlet+screen+recorder PDF link annotation
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bokitanepedozarezobe.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/31800401213.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/60573332834.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/25434977779.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210913172502.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/30970269480.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/56440471243.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mefimunadeka.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060218533530.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/kuxejev.pdfIn PDF document text
    • http://malifer.hu/upload/file/xopesivupimulududusixunuf.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3014390898.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/6012997632.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/80860345170.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210913_041112_171.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3be8239585e5164528f0b17e06399278/dugajusuxibimonemuget.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/31170066165.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gagatoxig.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jufema.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/tikanokaxapol.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/mavupegoligegelod.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/84340951769.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nifive.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10300 bytes
SHA-256: 7e7a56c1cdffa08a4fbc11ee9b4164054f6c6dbdf54a2531d1a087ee0882dead
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 17340 bytes
SHA-256: 763c40a9282b6c4f1cf300a00a1ac4d6a1f88c606c9e6d1dea84f149c8023bc2
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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