Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab751116a5988ff…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 11:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f736922bbfb18ea0d1baac342ad31ec0 SHA-1: 5c07ba9214cac3073d28ba7ac66ece3c6d823412 SHA-256: bab751116a5988ff9af21deacb1edbf8eec79ab8f1928e7518bf382e99e3c744
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, including those on disposable hosting, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious and a phishing trojan. The document likely attempts to redirect users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=watch+house+of+lies PDF link annotation
    • http://numere-mopede.ro/mm/file/12780231128.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a72be22beb375fd1ebaf99be5a00fdee/dasumodetibadukawitidiz.pdfIn PDF document text
    • https://ysh.my/userfiles/file/jogeg.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/zutejilovatebopafer.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/sogofijeniri.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/nosag.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/xapodapif.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/loseromoxatebix.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/13793566568.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/67031017917.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/fewukonununowuximu.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/pavul.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75fe67fea---18626738006.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97429634951.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1683681252.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/79748079910.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/getukeruzefodijeku.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88028162872.pdfIn PDF document text
    • https://dintek.eu/uploads/file/67837168092.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/14927344967.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/33684019292.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/zedibobunuladedexomojudox.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/livifotegus.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210920_225707.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/81465996982.pdfIn PDF document text
    • http://sial.pl/galeria/file/66289584364.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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 22208 bytes
SHA-256: 51dcc6ba78dc5c61a7b6ff04e7815ee78bac24da8fdf1ec95e2cfd49e1ffd213
font_02_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 10324 bytes
SHA-256: 46322317f4bc01fe7a4f5b502db8521366e74de6696838b68fa5e65ac358e3a1