Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c8c4fc504c2fef…

MALICIOUS

PDF

76.0 KB Created: 2021-10-02 20:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1a64f0c110381dad483801bfd31c52c SHA-1: 553c49f3a62defc7bccc14b0317b5da30e617337 SHA-256: d2c8c4fc504c2fef49851503923358f4d03ee7f000aaa2cc2c794d523db9e3c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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.
  • 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://infrive.ru/uplcv?utm_term=enthalpy+of+propane PDF link annotation
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/zabafuzatobokutar.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/379d320f7eaa08be388cbd9f9a864e41/fuponipiwifapememepesum.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/mitanol.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/lafilari.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sasazalamuva.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/wenajinutijaside.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/sujuvukawaregevisuxolil.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/76358727673.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_E070793913D461D3.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/61376981696.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/39297973554.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/74938966933.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39907371102.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/62785020404.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/22089466890.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/64339746730.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/xigumuwigosexuxe.pdfIn PDF document text
    • https://terracell.pt/images/file/48100784419.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gabepuseputobovuzaludeba.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jileke.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/luwesewonesedekatigexared.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/mebak.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/17369947399.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60974794093.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/lubudavivo.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/nexarasigagivak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 16752 bytes
SHA-256: 5ed5e63825bb3264eecb549a53a86058a333924afbae8acc6a5614786d823941
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16176 bytes
SHA-256: d4e6f9d1c3c482647bfbb15ad61e93b6b5cbbc63bd1aea10020f41e347ab91b6
font_03_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10292 bytes
SHA-256: c394857ed11ef2865f892da8715f473d5c007051c3e50bf03420b3f2b938a5a7