Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9b018fccf8b8f8…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 13:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfcaa782123ae5c40f1c8730ade117fc SHA-1: 236610f7ff5667bd51ffe01e095dcf74828316ec SHA-256: 8f9b018fccf8b8f860a0539eb47aeab4029c86f97716019f504ccd5dd6af1e10
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting an attempt to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=the+sims+4+mac+download+free+all+dlc PDF link annotation
    • http://sumisaedu.com/FileData/ckfinder/files/20210918_84834D22C3FD54DE.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/48727222324.pdfIn PDF document text
    • https://cooperspick.com/files/49531752440.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/56998574326.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/rugugabipugebupebopobogu.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/51369410705.pdfIn PDF document text
    • https://reniuved.it/file/gutixatubodakekobakorek.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631179019.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///32143478121.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zuwemijiritupubafuso.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/15665344721.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/boxufutumesosaji.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nupodabeve.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/24024039063.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jogixegubolubowuv.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/93141468759.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/23388125563.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rugujedotosizuniriv.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/7229377507.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/pasesimudamoja.pdfIn PDF document text
    • http://hrudolf.com/userfiles/78125775201.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/topukakowufogotewe.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908075747172197.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19511589399.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/48420408434.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/41899389070.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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 18600 bytes
SHA-256: 27e283a43e9818988b84b09e4687eb343016b3123d90b8967aa32ea08733cd10
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 10772 bytes
SHA-256: 96ecd45c4db94faedc2c8884f48f7227d2f981e76a1618cca1ff1da4871a0a6b