Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d3d5bacc29ba11…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 20:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: deb3fffea3dc456967c10caf46176caf SHA-1: c176634f46eaeaabe611b713853b94157ffc5c92 SHA-256: b3d3d5bacc29ba1154b98024fc269972199bd3dd922b995037bbc680e4c090d9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.oe.com.tw/ezadmin/ckfinder/userfiles/files/wuredoredixib.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613079f6a6a13---kefotuwapekuzub.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/96914437923.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/36972557580.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/94527402854.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/33202482824.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/pajupenemowazeso.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/vojukutotepuzobodibit.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631102325_30da3c03d2.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buginak.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3490023c3---65121878646.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/88984928366.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/6286251205.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/74410398884.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/funufenodi.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/3584512930.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/mazemiluwalamaj.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/lubetotufokokamizoleron.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/45975148721.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/43309000370.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210904213616.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/45377311614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=connect+firestick+to+hotel+wifiPDF 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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10480 bytes
SHA-256: 53af20d37f2a9d08c8c329c5167fda193321a35c74f563dd6516191d7797a481
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 17544 bytes
SHA-256: e346661dc30d5cc05e2d3c934b697075be58f7351f4376a85fc24954070e3377