Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3fb5c8b622492c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 14:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c446df63114a567a04c045d4b2f48fc SHA-1: 497e43a5f5e5ef22bbe9ba383281ed25dfacfd3b SHA-256: 9d3fb5c8b622492cde303bc9cdfaebbb5ee85019c0bd5ba8748acfd67e032d78
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://kurashi-kyoiku.com/cms/dat/upimg/file/papojake.pdf In PDF document text
    • http://duancanhotot.com/upload/files/51688325408.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/nalufufefopano.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/wifejixibobazonobakemezo.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/87683130165.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/7329837349.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210910_3C826D1E173663A5.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/dexafapawiro.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d997c509bc---didaletojufe.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/39916364284.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/finefawexik.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/33591347528.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wunemaxafoxuxuranupasal.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/benedebumevelam.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/65198773528.pdfIn PDF document text
    • http://becucci.it/userfiles/files/34773248348.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/40686725374.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/60076811541.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/56944707256.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/lisaneb.pdfIn PDF document text
    • https://esz.jp/img/editor/files/58702914981.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/38038332028.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mokepefugiwiloragirejur.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/67985423238.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/monala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+video+thumbnailPDF 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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 16972 bytes
SHA-256: 7b18f17b5a63574f46e4aa3d6f6e2d157135c154e36070f9521a144fe9d4867c
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 10632 bytes
SHA-256: 796bd4771333d244d7442a026c3efe930de13aaecaf708f7698b7c9405928dd9