Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fe740ea61bec50…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 02:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0752685267f1ed2555ee61687bc0d403 SHA-1: bc591e500275ec7228fb662c7a595adc76474735 SHA-256: b0fe740ea61bec50b0e0a7f8819b32210097139bb941e4a44293b78b4a59f244
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. Heuristics indicate it's an image-only document with an action trigger, typical of a phishing lure. The document body is heavily obfuscated, but the presence of embedded JavaScript and external URIs suggests an attempt to download or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 0 text block(s), carries a click-outward action, and is only 68 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 https://chilegastronomia.cl/uploads/userfiles/files/48376465558.pdf In PDF document text
    • https://pensionradvanice.cz/res/file/29094068352.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fubezidutopar.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vefujunefigobanejujebuv.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/tofejegozazu.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///wuvezeze.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fixogudugajuj.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/mefasatafugenesewo.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/sabonuvamet.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kurosiluzolagezinigi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2da2002e---8544172935.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/16052727933.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/tuzififetulufawujomokuta.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/12016444349.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/34616924169.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/56355192632.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fee07b61---funadumezirow.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/domowejubijozewa.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/18392809231.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/52701427778.pdfIn PDF document text
    • http://anna-bel.com/app/webroot/files/userfiles/files/36785544988.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wonadapuxejeken.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/namepojepuxetarogezowesux.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/48492590146.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/pafawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kingroot+android+11+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 14060 bytes
SHA-256: 1f8b2d45f7c27a93794fa3c0ec47afcb5a5d5c315b882758e9efb933e2dbf7f0
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 10252 bytes
SHA-256: 5e3e2eff7aa778704de96b43fb0787d80beaff84ef93f3f286f14a18889b7503

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