Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7c57b0371f65b7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 643d5fc552f1fffc2bc8707ca54d9508 SHA-1: 9f13c4cd219287c9c90df95d209df5d87a011d90 SHA-256: 8e7c57b0371f65b72c8707976d578253dc083472bceaada1044a6cf6c8ba503a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code. The presence of numerous external URLs, many pointing to PDF files, suggests a phishing or credential harvesting attempt, or a downloader for further payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=activate+javascript+android PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd1c039ef144c00fd3ebe92e230a5188/bumevexitufuj.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xujupomakogoka.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/nagefurebip.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/52077199790.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/24535360004.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/47352290614.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/bakozik.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/xagazozuwuvawud.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/bivusepidiberimo.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/28076916863.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/gonozavibofe.pdfIn PDF document text
    • http://jainfarms.com/uploads/36830372400.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8748880780.pdfIn PDF document text
    • https://everestart.com/images/stories/file/34907544478.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vuwawub.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lugatiwarokabitipamefavo.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/29443082140.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/lumebakozemajewafumimim.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/87431109181.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/25975517248.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/geluduginedituzo.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/36852297082.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/19660274348.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/81851128262.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lopigobo.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10640 bytes
SHA-256: 745c9958a8819f9515852d5d74eb6e2e310b1f04a4c6bf24636212c6f4298dd3
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 17328 bytes
SHA-256: 972707b996eb2cffa7116726fd1efc8556c561778abeb18b6708141ae945767a