Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d3380259aa8c1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 10:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ee06728e4eba445e7c6d437e5d2b448a SHA-1: 912feb4d1b75acae51648009495f6de28b8813bf SHA-256: e33d3380259aa8c1e0b78f6907c114731450c62b9de36424307cfcba414bc1a0
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or redirection mechanism. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure for users to click and download, aligning with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gelblighting.com/userfiles/files/feninawafefuribijak.pdf In PDF document text
    • https://shatalarab-llc.net/userfiles/files/ganikukegunigebowofadese.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/9888411981.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9353b2ba---xunuzopen.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/60153323543.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/5521460478.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e526rjeoevov0s70tijltv19i3/74185529660.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/wozemi.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/61883001243.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/66649679364.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/19374476210.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/7759031590.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/dulefosojiwegikilubizod.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109060828024639.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96090548769.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/lidatononalejejo.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/90532724646.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/gujufunowipapemukefeni.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/17873459872.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/72947353805.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/25103777323.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rafixelimemumuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=windows+10+pro+64+bit+with+crack+full+versionPDF 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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 17940 bytes
SHA-256: 459a854813913975d7a1135ff4a8e9af324676351896116030bb48c8d3ab75fc
font_01_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 11616 bytes
SHA-256: 5da3ba9162ce98095a712420286d732d55f9ea383cddb9c6274351d138b10f2d