Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f1f1d79ee489cc…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 03:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b45e9a76abf917f7f0035a44f7ffa6a7 SHA-1: d7dafa69221d7bb262bf069ca7d40993f6878913 SHA-256: d4f1f1d79ee489cc52f5e097f5c2ee42b43d86a663bfe8b80622da616f8dfdc7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious phishing document designed to trick users into downloading further content. It uses social engineering lures such as a download button and a fake browser update requirement. The presence of external URIs, including one pointing to a raw IP address, suggests it attempts to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/41892934687.pdf In PDF document text
    • http://nikolalepojevic5.com/multimedia/file/jutosixokumefej.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/78087763166.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/52046794183.pdfIn PDF document text
    • http://denge.aero/upload/files/53560230275.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/89681667233.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/bavinovirasuxajej.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/92824064558.pdfIn PDF document text
    • http://adice-area.com/pictures/files/mafejojupomuwotujesewat.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/35877493701.pdfIn PDF document text
    • http://autovoda.ru/upload/files/duwuxujitebi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/6504372752.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/mafokizaduvosijezasudez.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padasitafogilafej.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/muruwazofukakeniwadinos.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/bejukewiriju.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/vegatedabijiwisesijufosob.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/nituzuxiwuzuputuwoseporik.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jekiwugirigibesupub.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/70675549175.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/47340647814.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nemaxev.pdfPDF link annotation
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/41984799256.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142f62df0b69---52227004563.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tajotigokudikavuloror.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/nigizigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+extract+apk+file+in+pcPDF 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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 18544 bytes
SHA-256: f9775d37b16be09d4c75b6b5e7cb976ec2bd82838328822a94a72fb8580ad028
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 10576 bytes
SHA-256: 764265d24dfa622f5d43883a442de202acfe806dcd8f13a76046072692406512