Malicious PDF — malware analysis report

Static analysis result for SHA-256 a690a3f49fa11f9e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 17:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6d43a4594795b6f355a36e14415ef11 SHA-1: a77ab3c2dde4d4bfa1083a7038966ee2eac6ba35 SHA-256: a690a3f49fa11f9eb6cdaeacf153454daa16c20f296697feaeef3dba024f89e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=rupaul%27s+drag+race+all+stars+5+123movies PDF link annotation
    • http://rongqichem.com/upload/files/bobaxidon.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vosananejilifulepopij.pdfIn PDF document text
    • http://hkacca.com/userfiles/lurerevuzusavipiripebebi.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51812414334.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/papurujexarawato.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/xekadunabemajedajadu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091108242754.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/41719511934.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/takenomevanaxunikilekuwi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5bb90653---96763767536.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/buvuvotorifox.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/32879449273.pdfIn PDF document text
    • https://jotelek.hu/files/file/malifamatavofuginawedo.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/lapuzubitugazoxavinupife.pdfIn PDF document text
    • https://tadimtursu.com/image/files/kilesajudesuvajabuvarize.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432f8817d90---71926130544.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/11068739758.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/gubuxa.pdfIn PDF document text
    • http://fitviewer.com/files/file/50928349059.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/kozotexesiwimagoxigad.pdfIn PDF document text
    • http://myredm.ru/uploads/file/68607652330.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/28866609472.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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 11476 bytes
SHA-256: 708593bc9b8497ce54b923ea64bfd81a981a7d2716568b9da0023e8c6e86e2e7
font_02_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 18736 bytes
SHA-256: cf9523b246acc052bc98750281fba4547cad215fe0993a98e4ccc5826fedcf34

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