Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ef59658c4b676…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 21:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 30b7ec9584a5164da0a53d73179dab8a SHA-1: 754541fed6b03cac2fd7163da3304fdf7f5bc883 SHA-256: b66ef59658c4b676be2c81a69195b12170f90d27683a6574442ba16ad09b2c6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely to distribute further malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=white+tiger+life+cycle PDF link annotation
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/rapolawotexom.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/digavukurelej.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/ditavuk.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/worexopofonetubat.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/lusat.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161309161b8278---wizawifigogevuxoruwuj.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/95506032860.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/57509284406.pdfIn PDF document text
    • http://sodrex.eu/userfiles/file/kokiwobiruxalatew.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/maranove.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/fuzajodenunisariwesug.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/434ba3879c918060ad8c3994de16556a/28576752590.pdfIn PDF document text
    • http://ahknchem.com/upload/files/kaluziridelidexuro.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/80008530442.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/64544932914.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bixafibolawej.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/42805007252.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-26/20210926134924956886.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/69453401027.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/pabilomopewegesed.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/nisajumonolebaxali.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/sazejefeveduvuneri.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_off0000bc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC60 17572 bytes
SHA-256: d3bf6a5c34969b4f1b1c9f6ba8eac080de40035e58e6fd92dbad1a037d5f5e23
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10168 bytes
SHA-256: dbf3fd9c10a870cfab12f94ec11884c024cf082271eeb06c4eb1955aa54c7025

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