Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e433bad2f41d27…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 11:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ab729aa67fca2cd521360be0f52e8b3 SHA-1: 803072e5475fc7f8a436b6c419270cf5d0211e63 SHA-256: 96e433bad2f41d279637f85f382f7c5df4476c095cfa90a76760322db1557afe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the external URLs found in the document, such as https://nazragame.com/calisma2/files/uploads/83803588842.pdf, which is a typical spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nazragame.com/calisma2/files/uploads/83803588842.pdf In PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/lesipazuj.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/62893495193.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6602f1b0---texovijaniwutasidapute.pdfIn PDF document text
    • http://parateam.cz/file/nonopimojotozeteb.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/xofububaxagokipisenofemu.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jorevegaguvipefu.pdfIn PDF document text
    • http://thepducphat.com/upload/files/11024915424.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/texajajeriduzawukinadigol.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/naxazinalokekidut.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kogatodiwamivitutebovevox.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/tajefinemupavuwivofatiko.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/15654417626.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/74844083230.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/6146268584.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/22536909528.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e27bec5018---sudidaluvukuziduriza.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/japifawufobuluretevibiwos.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/5537222325.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/94198156050.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/folaviferale.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/pajeluvodiralegurekenowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+descent+of+alette+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/moserutulexakonog.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 17848 bytes
SHA-256: 2eabd44f9b580c132e6e4d19a5f5597e3a11ad879a1ec6b554f459938f772113
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10488 bytes
SHA-256: da084e155befddd4fb28afa16b0ab417d0d7da1f1ada591f31aefbfb117e540e