Malicious PDF — malware analysis report

Static analysis result for SHA-256 4655855a7b451576…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c627d8920040119fedbaecb80768d34b SHA-1: 9c520dd8a24e4a4e5455bcd037269c04c717a495 SHA-256: 4655855a7b4515760beaea354e6aa5bd65191da993b2468df85b0ba4a46dbeaf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document with an action trigger, typical of a phishing lure. It contains numerous external URIs hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://infrive.ru/uplcv?utm_term=bumps+after+plucking+eyebrows PDF link annotation
    • http://khodahoanglang.com/admin/webroot/upload/image/files/bogodurebum.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/1731847988.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rimikegololitinijimolex.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/xojebojinakevasoze.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/vejojevujenobasu.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/93885611110.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/83772067463.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/dazoxi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/silapagim.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73059591735.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/43096665508.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210926_11A42E28C8439150.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/bubusurujitetixovosibogan.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/tadeludanomedojotixixuk.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906030257_638255948.pdfIn PDF document text
    • https://goodline.by/userfiles/file/sigurifekofisegikarasa.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/mewutejogogukozam.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/lezeratatisopadizaxamite.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/48920795952.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/22155551556.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/47137945383.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/pomivalutezifat.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zefiwinunoruz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda6f01558---99767934478.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_off0000aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 14200 bytes
SHA-256: 6e5d24cb5d9c23d43e9c2c93bd2aba7a1da1c3f87f1e525650c67503f5eb8e08
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 11408 bytes
SHA-256: e4e9b252721882b87695e33db9d6e4143c990c5f83003140898d7d9c0e90c202