Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16869063a391a05…

MALICIOUS

PDF

74.7 KB Created: 2021-10-13 12:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eda7bbcd9f548e4cf28209071b2ab942 SHA-1: 8a4be5a62890fb58ef3fa48dd83ff144e1d32454 SHA-256: e16869063a391a055861f8c8191fba342bb58ac5673514f9bfbc595393505ce4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://outspokenholland.com/userfiles/fckFile/20210928134948.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/podetesegalanajete.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/32459196083.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sudubumatitodola.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/sujejifasixiziwovofutu.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/soxuvikekuvoji.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/bivowaramixizijefotuvar.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616392dc4da5f---24001194987.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lisafilu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/wakibomexoxim.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/dojis.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161667a77df180---gexufulugepivoruv.pdfIn PDF document text
    • http://uteambio.com/upload/files/kimak.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/tomegagabid.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/batibumabedobabixev.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/falosagira.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/88906917030.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/vovamuviretazubukib.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/37510667222.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vilagokotizezizosane.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/74710469757.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/goxafa.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/lonuvuzib.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/92295501023.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=india%27s+struggle+for+independence+by+bipin+chandra+pdf+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_off0000be5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5D 11324 bytes
SHA-256: f468152fa6b203c0fdc5ad0790eefca8a5578b7c2e4dc49e384ea4eaad6a1468
font_01_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 17004 bytes
SHA-256: 58575654de945c72d83af6f6bcf1307540305e08f9ccc9f6cdc0f225422c7fa9
font_02_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1