Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c5c86537e2f36e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 06:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 510f6e006e902ef94392e72a492c3b53 SHA-1: acedd0472b39eeefd637c1290db160091d902e64 SHA-256: 91c5c86537e2f36e2d6746a5acfa74544b2f458dd8901cc66195dfc2b2fd4d4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it's designed to redirect users to potentially harmful websites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://huspanda.com/data/ckfinder/files/zerodixabatoneke.pdf In PDF document text
    • http://railwaysrailroads.com/upload_files/files/39085169018.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/47800542462.pdfIn PDF document text
    • http://superazs.ru/images/news/file/bosijadipologilezusujapag.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17277194862.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145498e99ac4---69300675320.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xeguxavoxavadoruwubek.pdfIn PDF document text
    • https://wasael.com/userfiles/file/84785218716.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/mosiwipunojanunedaku.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/81311764930.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc12ba4096---rakabegajariketewafor.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/nifikadigemigigujokuretun.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/daxajipeteso.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/valujemozewikujikexaru.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/20020107265.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/niwegezopuw.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/61896895478.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68246133259.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/73402154083.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/21574677553.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/29470630709.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/99019562835.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/7973883001.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/10357890331.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/67535030238.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/fejakuwirase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ben+10+mod+minecraft+pePDF 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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 21380 bytes
SHA-256: 04227e4e2659cd7c14e0d897ae92b353748e92a8b8a8be9955e855421c325f52
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 10792 bytes
SHA-256: 314837b1b69e760c37c1643d77cbe7db41ad1b5947a94b18bd37ef7087cd9724
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1