Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f849e52f00aacb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 23:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a31b179412ac1167262897f1bfe7a9a SHA-1: c6edb66c4a940e5c3740cfec3d7e398d63098642 SHA-256: 87f849e52f00aacb374cc69140f84b05da482a95c8b4639a533e6f0cc4817987
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=edenbrooke+julianne+donaldson+pdf PDF link annotation
    • https://budgetparking.ca/admin/uploads/file/63199084877.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/1595751048.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38950683439.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/dekapibifam.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/12219283793.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/66039471744.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/ladasutugi.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/jusajinirovipov.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/51668974487.pdfIn PDF document text
    • https://ibericadearmerias.com/file/vogaxal.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/88298018546.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/79813384221.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/46841174743.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/34249840118.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/28665089244.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/663d5f8d12d73d62f69a8057ccc8968d/kesaxiwazav.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/94240268889.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gumabasivebaw.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210912221633.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/44021920899.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/89376545501.pdfIn PDF document text
    • https://udruga-invalida.hr/files/fisafajoxuvom.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/vajur.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/48070541400.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/6034004285.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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 18000 bytes
SHA-256: 4b24e7ea39ac194445c15c14900acf736beac7578c4a239fd264c8b62c5e01e3
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 10840 bytes
SHA-256: 783040a08ed3e515c85f69e09b5c214090b41a076d90185c322cd33584709600