Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe128cdfc3c49b00…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 22:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 00550820484eef2a3dca495b3ca1e064 SHA-1: 8c0f3ab13fdbc25ce7414adc0c7e1aacf18b8c94 SHA-256: fe128cdfc3c49b00a80d54c948c00842e74ee6489302f1e13ab024fe584b794d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on domains flagged as potentially disposable or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a mechanism for redirecting users to malicious content, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shtaket46.ru/page_edit/_samples/userfiles/files/95353998550.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/neliropobixovo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8388574---18928867861.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/95421780786.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96885cfcf---9398528827.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/92151396936.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/suganorizu.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/29391089337.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8552012546.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/92176686143.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/72665616554.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/mifubelu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/41269013061.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/suvuposemijamulunorati.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/32002956723.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/76018265776.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/54904365487.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/85378910862.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/41197178520.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nawidewagiridurakaxovul.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/92781466782.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/96632906594.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/zivebil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unni+ikki+movie+download+filmywapPDF 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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 17792 bytes
SHA-256: facbf6ba6638f89dd8caf679a22c06ea7f35b8f341a7abea9326de2b0ddcb233
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 10656 bytes
SHA-256: d755418434db47e64ec54845cdd2199e6c647b2d42429abd23ee6905ec060e1e