Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dc2de8f8578490…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 22:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2c335ec67429e7f86bfede81e94bf870 SHA-1: 5d9bf6e0c45644ff49d45c894b5f343211f216fd SHA-256: 13dc2de8f8578490026a93d7f3ee0ad60919fd69a0a1366569dc6987bd09ffd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=messenger+apk+android+7 PDF link annotation
    • http://4rrecycle.com/files/file/23231871968.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/lipezutavok.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wogufupupubajujagofi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef4311c2e---fanef.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52817780674.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/61883001243.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/52940166225.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41220168867.pdfIn PDF document text
    • http://jfe.hk/userfiles/38623538809.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/wuwebiguraposamofe.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/5914066331.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161319ebd75f12---82545183807.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/finonewutenibupevomedejig.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/95527533715.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/85683459132.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/zaburapesubinunelanabe.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/12855473468.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/xawisulajuvumok.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/wininodivukoloz.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xonenat.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/15556903911.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a86048b9---23543412824.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/63609096744.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 10556 bytes
SHA-256: 6bb6dffc92d03824e3897297b32705b64742309d79937e3cf50534c994ade200
font_01_sfnt_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 20112 bytes
SHA-256: cff294c36f8609b62b62b293012a2111b749beea4ca7150a8021892bfabed385

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