Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed25432cc2fbd27…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 02:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82715d739645a65a48835c072b51bf8e SHA-1: 3348c4eb0bc36382ef4eb566605c091f421b5db1 SHA-256: aed25432cc2fbd273f706043f5a6f8ca992c78af2eade4795cd7d03cb219f081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://urgentcarepb.com/userfiles/file/wonorujazetitabedatezi.pdf In PDF document text
    • https://minhkygroup.com/luutru/files/1608664726.pdfIn PDF document text
    • http://archbot.pl/files/file/35541936924.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ragekaxipuzuti.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/1907983118.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gubiratomovovinawi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/zopibenakumituvifujeb.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/84173330211.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/77976414833.pdfIn PDF document text
    • http://ave-france.com/pics/files/bugozomufolupoweri.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/3833405429.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/sewasinovurel.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/33990963911.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/navawogukemixipaviz.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fotijanemewolu.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/57361294112.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903190136177.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fidupurorupu.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/34911711534.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/57493776926.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/84822337307.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/tidenise.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/fudaxexise.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3266c94efda7e9b30d0f7ea2249fe8f9/53258510683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=oxy+iptv+by+neo+apk+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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 17388 bytes
SHA-256: 3d2325c158caee96c9285b4e108687dbb67fc9b5ba5efc99a3ab986d4498d519
font_01_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 10744 bytes
SHA-256: b546aef26de8a6c41172a72be297db88955fc030035f9596d2a79b7c4f6af04e