Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3c65af38f7e6ed…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 23:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 03b3f11cb99d3b1cf1e2b0711095cf2d SHA-1: 5835840ea04f90b16996cf572f6c760ecfa143f1 SHA-256: cd3c65af38f7e6edad1413fe41652fe5f6cca2e3335ab6d8611810546691f619
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=ps1+emulator+for+android+free+download PDF link annotation
    • https://esterkins.de/ckfinder/userfiles/files/54820440763.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tepokubujilipodivad.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/juwameniwukufi.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kaparitowojaguwerumutu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/1343926386.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/7249758362.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/netefotugogitofa.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/53424896755.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/suzebisujakizojunejap.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/tubabebemizobaju.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/43926161485.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/58121300855.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210912232131.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/telaxubedevarenozenevuguj.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vubadapelove.pdfIn PDF document text
    • http://goldia.cz/data/file/vogaxusasusakerir.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/89556877220.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wutabakorafevasojojojid.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rukejetovevexikomezusote.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/novoxiguwolesu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/44102937496.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109141022345687.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/99809633095.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/89175137706.pdfIn PDF document text
    • 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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 17832 bytes
SHA-256: f1603c3a01e94a159aabb194bab26c5fe60a5e584dba70ec80a0edf4c24e3bb1
font_01_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 10756 bytes
SHA-256: ed6d877d2399111b154c4666bdcedab023d2d9ef18babaf8a33e8ade1414292b