Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa697400f90f5e0e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 08:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2ab053cb538c7e9effdebf48b7ff2bf SHA-1: 93100905c8f1291235bedfb1db320f95c28540dd SHA-256: fa697400f90f5e0e902457135242bd9953f74c0cd023b03322f28cb2cbae05d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://aljazeerahpetroleum.ae/userfiles/files/risolori.pdf In PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/86176466663.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/24288745581.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/barotazonifidofilakebapil.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/66485105510.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/76045037129.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/36898296228.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912025029.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/basuvo.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/96993113789.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sipikilibeki.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/14048044726.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/rabobiloteb.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/xegakeloteso.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a23b5b1b33---bokuporuloxibanoro.pdfIn PDF document text
    • https://protum.se/file/11262369344.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/56482773762.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/9996635041.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/47438873536.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dinavuzesanukirezobizuku.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2aee6d33192f3240f3f2bb65144421ba/belapamulugenuratujabaw.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/77560359391.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/36567054561.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dalizag.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/99203791271.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/73765629584.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/49766629187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+apps+for+android+10PDF 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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 10672 bytes
SHA-256: 89d525067cfd311690073bd056210c5696eef70352fb97bb479d721875c4c027
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 17672 bytes
SHA-256: 98a988b068773197d5ac16f38eeafb3678083db915f29451e4b3803c6e3baee8