Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe768175183f7b0d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa7c88b748d7958ff4b3eca7a501f6ab SHA-1: 2421fd99ad2f499537ef8ef00fb9cf90b96b749b SHA-256: fe768175183f7b0d94d8178aeea151fb821a98b068a080b1a964ec00a396d239
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://imi.vc/upload/files/92931801423.pdf In PDF document text
    • https://congtydaihai.com/upload/files/siregaxanakimamur.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/somuwizomuledor.pdfIn PDF document text
    • http://superazs.ru/images/news/file/20382172098.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/4819923879.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/roxag.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/zafefuboruroxewefup.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/57426478435.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusujupegokijodiforiso.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f243144c4---9611280920.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/napuju.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/rofogiganemapanuru.pdfIn PDF document text
    • https://value.ae/userfiles/file/nenugixipivazuxalewolazoj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/9373732838.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/gizowazutadebonafawuwibeg.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51115983705.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/kakuravedewulegurom.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/11502930732.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/8762788529.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/94457362560.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631014183.pdfIn PDF document text
    • https://euchebnici.com/img/file/naxebusinevigafibitox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cleo+gold+apk+download+for+androidPDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10616 bytes
SHA-256: 60d6bf9a08e31a2fdce74034b47f4d8e37756cd8b5f03dbac523962cc8c7f9ac
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 17460 bytes
SHA-256: 693e229bced84ff645f9c8e700473ef343b27564d358d89ba4db00cb4da6fe63