Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f92c02f537b01d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 00:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f79da69181859293efffca9a74d9c39 SHA-1: 69b7b83e56e51fa36f906b62087325d449d72a3c SHA-256: 52f92c02f537b01d166eea6d338edaf076e362bef98d382be9b80b12c0f09c9c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains a link farm of other PDF files, a common tactic to obscure malicious content and bypass gateway scanning. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://onsale.social-push.cc/data/fckeditor/files/35356822055.pdf In PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/535531018.pdfIn PDF document text
    • https://ratodua.com/contents/files/46265879146.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xumufi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/70186430387.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/70641726562.pdfIn PDF document text
    • http://esistore.de/userfiles/file/surilivexobon.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/21698311237.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/46331958037.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/81431011648.pdfIn PDF document text
    • http://exosushi.com/uploads/files/75835411066.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/juwesuwanupurirenitulaxa.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/mixavumu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/tujujifa.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/78662594607.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/23176385418.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/19734766222.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614398f33e0ff---bezinif.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/85530568908.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/91050857977.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d0a209f3f9c1e3249186c2a8057dbf6a/18200105632.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/mepewoxemubarewumev.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gozajobonobulitixavazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+hero+mlPDF 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 17288 bytes
SHA-256: f55ac4d922331b79907e1e54c9526234f0f0502347bd1c077eeab77fc022870b
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10040 bytes
SHA-256: f10ff085f419a50095b172eaefa88a93dcb20495daa524183a5316e3097bd3a6
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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