Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd53e91fbbb0cffd…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 07:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d9579be32d17a2143017bf2c48996ad SHA-1: 9c553d11974b205ac093677f0dd200234071a0d5 SHA-256: bd53e91fbbb0cffd61ed0346d6fe668bd039eab5847d4442007d2870e32892f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially used to download additional payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 http://fulepmark.hu/nyebu/fulepmark/userfiles/file/92887570244.pdf In PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/95143595952.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/waxopurasaperuvas.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/dozosalabimabovugubov.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/65509696723.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/70440014220.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/21002631160.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jidogekigenatukop.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/26398796579.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xutulosozokugudum.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/34754515632.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gadunajiganeto.pdfIn PDF document text
    • http://orthopediedelft.eu/files/68485147679.pdfIn PDF document text
    • http://vladekoservis.ru/files/92230667694.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///gidekabasopovafo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeb8dd02d0---zajubowudurur.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/58504859739.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914151739843175.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/todajutipomu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/fexawuziguvunivuxukududul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ranking+every+fortnite+skinPDF 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_off0000ab37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB37 14812 bytes
SHA-256: faba54b9fe4c667dfaefe677483b483511fc22b7518a328c22027506bdf87210
font_01_sfnt_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 10660 bytes
SHA-256: 4fc0df604bf2c1403c57e9c9d56bf3ec64ca8c931a061a9385117a8f51e8a3b5
font_02_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.