Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdd9dfef4a127b2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 14:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ea9c698f8f34d4f9806daff48c25983 SHA-1: 6bf2354834043f6507c8a35e188c4c8a9b967bd1 SHA-256: 9fdd9dfef4a127b2411e87f346091e79d8ebac3eacf8a4d7a37cb4b73fe83ed9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to obfuscate the ultimate destination or to distribute a payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://endeligmandag.no/e-brev/data/div/suvugutomotebed.pdf In PDF document text
    • http://carmakers.cz/userfiles/files/pijanamemofoxa.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/50424393054.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tavevudivox.pdfIn PDF document text
    • https://raljob.com/userfiles/file/rolatugofalazamobupob.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/musesilukavizodokukopetu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0943abd094404dda9cbbe6e32d44312c/74249987091.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/fenefudoraxupatuwunoma.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxalisajojemi.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/jelitibulosadakebuga.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-3/20210903062158775164.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5b10b320eb7d1c21d5b335c41dc69671/rutotugekowijagolozovo.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/tenazalewelonib.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wasexak.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63711904635.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fonubopurotojazutub.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/81702033788.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/pegudexam.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lobuxose.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sazemamujijumusepovuz.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/59820991668.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_135915.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wemerulafujubanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+to+word+converter+mod+apkPDF 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_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 18204 bytes
SHA-256: 66b9df621167126acb3131c5ceb28d4b381ef19a5fae00d16bf4cc0ec6020c1e
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10720 bytes
SHA-256: 6b5727681201bb2d781d18f6c34a6f85eaf1f08b412334f84c9bc3056b8dc29e
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1