Malicious PDF — malware analysis report

Static analysis result for SHA-256 424ebb333a4d2d72…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 13:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 503e881a6ea85db872f04f730dc63cd9 SHA-1: a8a770936cd53681f6917cfbd13cff64cdb29719 SHA-256: 424ebb333a4d2d723cc54b436a0e370e1b4c06d7670168ef5f48b96a86378321
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dycelife.com/userfiles/file/naguti.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/37473847239.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/96544917061.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12065891951.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/92429079728.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pomafesusutazuk.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/vadotuvibe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ruvabanixer.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/raveb.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e97801ef3a054d32d8dc047de694b280/somomerurekufetorafejabow.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/46569214042.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210901/files/20210901140917.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/buxidavi.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/70004327566.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/dexelebe.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xopupaxujurovesi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/tarutukufofawatubusezudu.pdfIn PDF document text
    • http://asid.rw/userfiles/file/vabitowutavew.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/wazedili.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1e56d903---sowixewasatufa.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/49690762597.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/342463bf2d323aa837e4c02fe2747762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=scarcity+why+having+too+little+means+so+much+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC0 14452 bytes
SHA-256: 92566392e3707578afd844510048ae7b663eb57ae5100c6787e519726e1d6eb7
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 11508 bytes
SHA-256: 9f38fb44826015df4c98c1bf4e652fe47742acf414c4242aeba4f3ef13c29e42
font_02_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1