Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ef3ee1c9c76857…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 20:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 478fce9384b7a782b339c24f7ef33ce6 SHA-1: 7a2c2610a0597811a8378331fd18f478a385e7f7 SHA-256: e7ef3ee1c9c76857916b7168bef09179b2ea37dc9a176172630391d08d5a6502
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a business email compromise (BEC) attack, aiming to trick users into making fraudulent payments. The document's structure and numerous external links further support a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://behagi.eus/files/galeria/files/gekitozexela.pdf In PDF document text
    • http://delfosventures.eu/userfiles/files/56185610714.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cab70911---bimukema.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/22203043734.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wivamuzo.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/japirekejalideduti.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109100610351287.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vewowazesitiregos.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50832792207.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/77840072272.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/5109443253.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161332b7ce3230---35177142206.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/20901737555.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotajod.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/58053994532.pdfIn PDF document text
    • http://mirrorlink.com/public/files/files/lovizatewijozizoparijipij.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jejamawewukafajokikugeru.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fesanigada.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/rezatuferipon.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vulukotujoda.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tuworizezajoriwivi.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/dozovafetujolaluzipusonu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kumevodekazexejapadexu.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902083100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adding+microsoft+exchange+email+to+androidPDF 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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 11004 bytes
SHA-256: bf9fd025c5b99aa6dc09b9a2c327d1eb691806529a865dd32874a60ff0def3f1
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 18768 bytes
SHA-256: 0a0467e7679e20d5237d442fd5e21725619ccb60c277da6f662f9306bb8e475f
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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