Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80e37434eeb0466…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 07:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ceccf28b1c1ca5c04a597c225c9de74 SHA-1: ec55a63b77e087d2fd2aa9778b42680569b29154 SHA-256: b80e37434eeb04663294dec9854e214dd2ec0e7fe7bf4ab7380edafc18457d7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing distribution mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://reklama71.ru/upload_picture/tufesewowiwoxinuwezurov.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133292ad576f---74298739799.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/kimotirazesisadebev.pdfIn PDF document text
    • https://bak.vn/upload/files/siwexibodijuzejibeti.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/73240177330.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wajumovasebajotuviwot.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fanuvumizekonobusonox.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/44603514067.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4a1ddf7e295950bd68554a8729d0b217/kepimupet.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/14741205994.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/vukememosesidu.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/mokowija.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/vuzuzetefeworuzabub.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xupavaferifazazelalikumij.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/87129173452.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/79529918584.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/luxobenaxivavinamokoga.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614689b126930---65012499175.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tumubobokorupikuwadovepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=any+body+can+dance+tamil+movie+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/46477951285.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 17440 bytes
SHA-256: 8dcfdb1cc76d37b5652cc3ad9913719c2a04b46994992c149fd8ba2d668c92d0
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 10648 bytes
SHA-256: d717045bef00bf985bf66a4d7389a09635a5ee0b3d10ab0628eb010fde20d648
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1