Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e9e1833688204…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 19:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cccf840190446b99bcb59eac7c06b54b SHA-1: d76d91eb52b76b1da9a27c0c459107d4d44f2453 SHA-256: 404e9e18336882041ee30a3bff5a127644cd1e41bdedec90fe175db95b427c93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, hosting numerous links to disposable domains, with one specific URL containing 'pinoy+movie+downloader+apk' suggesting a lure. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=pinoy+movie+downloader+apk PDF link annotation
    • https://kamhosting.nl/ckfinder/userfiles/files/93356490898.pdfIn PDF document text
    • https://network-italia.com/file/sesokexexekirijakadafi.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/fugagete.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/76621344954.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/23174744431.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/duzikuwitevubowetinaf.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/81481225261.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jolojowal.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/bivisimagavit.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/71162224226.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161424f95a4a69---zasiruwe.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vudasowu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5db2e4d7c6b29824c2cc037e325f2e56/lurotodadebujolenu.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/jukutibowaravut.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/99531021755.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/pogenafepazi.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13627186286.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/panoxadawezif.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/32395937252.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/zemotufawexebis.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/11702814037.pdfIn PDF document text
    • https://haidangpc.com/contents/files/lafebexetofusezir.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/nipifugu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/53244378000.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210914/16315585024135.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_off0000b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 16116 bytes
SHA-256: 8ca5c683d4241b24cf3cb402ccec76dfcc35e942c8f78c05ce28ccf47b38b6a1
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10644 bytes
SHA-256: b4850aea49305abf5402a8d8ea09c796a651a6948619b4011e329ee878a34414