Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace7b5b3897f838f…

MALICIOUS

PDF

85.2 KB Created: 2021-10-07 03:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bc54e7e928be46877dc27573a3390053 SHA-1: 8e8463693a2ac60e1f5a7277d999953a2cade3c3 SHA-256: ace7b5b3897f838fb6ea5eb75bad9e735df52fb61d62f2dbeea03fafec0cab2d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The presence of numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggests a link farm or redirection mechanism designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://citlak.de/admin/UserFiles/file/binijatuxesitavemit.pdf In PDF document text
    • http://www.como-grup.ro/fisiere/file/zidigejam.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/zodakenanubifepe.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/kewutalanexupetaka.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/37847085129.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/anh9phgr9efgsufb9pgmgtj3b7/54799391890.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/85845168964.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sowoletevuwis.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/17380942434.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/vixegawakexubekojin.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/dezixixupibisigikap.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/48103138409.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/xometupuwexovu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/danekerunuvutizuvar.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fevezisago.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/visagonevixukit.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/36960384112.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/lozugusu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/95296473426.pdfIn PDF document text
    • http://paliukenas.lt/i/File/gamakomobokok.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210928165741.pdfIn PDF document text
    • http://imi.vc/upload/files/6174581031.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/20821549132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=today%27s+astrology+signPDF link annotation
    • 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10400 bytes
SHA-256: c14d809dcddc4eb268ee2bda7d350a37bff0aa5e22cd64a475ae4dba5bec277c
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 17912 bytes
SHA-256: a5b6705bb1e8878ff2ba1eb60f57049f2d1d5aeef42ba86ab838769ac2f36230

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