Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f82ab32e9bb93…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 20:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7065101b4f981127a5b29beef77fdfe SHA-1: 4bd574ce799bdc815b425648f4b64c1a52d55511 SHA-256: 490f82ab32e9bb93dc72a51dcd8c070e06708278dc2f572ef34288c8602401af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://st-ark.it/userfiles/files/resazuxasur.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/74157301467.pdfIn PDF document text
    • http://lejuriste.ru/files/file/51207416657.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/xonerunivuzam.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b57c81a00---48422471302.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/dajamosoluvezewuj.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/vexebovokujabuxoz.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5142ac805---96484081098.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/tezelegegogizufawajukegog.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lagubiw.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630704721.pdfIn PDF document text
    • https://doitoutdoorz.com/file/1p5GLIycgDy3KSYK.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/27096643275.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/101730920.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fupefo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/13267816717.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/22886349084.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/dalozoduzadosobo.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/movudosekusakim.pdfIn PDF document text
    • http://stl-hk.net/userfiles/pulatu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/66617647099.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/34716843464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vid+status+apk+downloadPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 10400 bytes
SHA-256: fe15bda0e9acd56a1032edc5871e5cb11f1355a83f6ffdc0719c5c1a1e4391f2
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 17992 bytes
SHA-256: 58cfc13980366a5da7e309025d5f4c5cb75ada91f52c470dbbb36124974088f5