Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a19f8736ca46667…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 18:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84937a0b6b942e8a27f51e15172fa229 SHA-1: 426ec251e378ef3e833311457c5ebd8a0e2fbdff SHA-256: 9a19f8736ca46667439ed42fefc09b1706109bd9667fe2af170085b1cf8132b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The presence of an embedded JavaScript stream (T1059.007) and numerous external URIs, many pointing to PDF files on potentially disposable domains, strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment (T1566.001). The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://jamurgoreng.net/contents/files/galijigalixuxo.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/gudokotemamo.pdfIn PDF document text
    • http://rem-proekt.com/f/file/73396352879.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/fegowaxufe.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/13117690811.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/26202902945.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/38886952858.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80610056985.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_222507.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/64177631103.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nebofevofawupow.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/16852541742.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/6260306199.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/84444304551.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b142e9537---16540558690.pdfIn PDF document text
    • http://citranco.com/users/files/69582860641.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mametesoxulavimijaki.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_2C569ED5A21D4FF2.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/bupekojufiretaginumebajex.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/50182804990.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/xefewixogiwofiwilodexi.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901205343475931.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/89381107831.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/vupatajeturok.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161411eedda824---lovopimigubevutewa.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/84566400458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+family+2016+documentary+watch+onlinePDF 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_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17720 bytes
SHA-256: 292bcff913a60edd7ec9f420ea1df488bafd34351067ea351e638cb49bf15251
font_02_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 11296 bytes
SHA-256: 2e7943c474beb43b67c8dacf4ae42088dbc2d7dfd32d8ed0fc444a2b632b86bd