Malicious PDF — malware analysis report

Static analysis result for SHA-256 c398b252fdad7412…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 06:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07a068acbb2be9b0c0af9fd4da9da90b SHA-1: 47de1593fdb2bc3e81e42f137a2b626e3be450c0 SHA-256: c398b252fdad7412bcdf281b23dccaa3bc73a150590f115dfd39da759e063830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as downloadable files, suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92e50def2---47020017163.pdf In PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/welidigilipevo.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/87896372732.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/wuvefilunizawojisuges.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///60519754480.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/87370270769.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/12213286030.pdfIn PDF document text
    • http://hotechike.com/files/files/71110130637.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/97900278226.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bosubapavo.pdfIn PDF document text
    • http://chinahongji.com/d/files/20867640294.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/76914430505.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/184564084.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/gokezupumifekuxo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/vixavatosejulutawo.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/21282340773.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/72193279113.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fuletifinolojefo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/56601637755.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/gogisajuvopa.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/samajeteresi.pdfIn PDF document text
    • http://balalajka.nu/media/78957250015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+road+pdf+downloadPDF 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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 17128 bytes
SHA-256: 57344163f06a659ce6637a09a7295e19cf4d4d4c09c08e18ad13efae1ee676b4
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 10288 bytes
SHA-256: d8919c5bbc9c96ab5c1e86b2d46211d175d8276db5f7e1fac2c98d269bf749a0