Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0ecf74473bbda6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-09 16:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41a5e48dc4717c80edb5adf21e9cb5a1 SHA-1: 4af12e6411d32721be25f16436da82fd9263d5d1 SHA-256: 1e0ecf74473bbda6b47a148e00d2bc9378bd08d4ed5e34ccbbc8913873b7606f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, likely to obscure the ultimate malicious destination. The 'utm_term_redirector' heuristic suggests a focus on SEO manipulation to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ktgroup.co.uk/ckfinder/userfiles/files/60918116912.pdf In PDF document text
    • http://client.diffuse.info/files/54075945118.pdfIn PDF document text
    • http://msiutilities.biz/documents/vizikisino.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/4105674978.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sizibudomafawizirawe.pdfIn PDF document text
    • http://findusafranchise.com/files/files/jujativulilupuxixo.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/10397282890.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/68615565146.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/da87e8186461ee16ecef7c0b2705fc8a/10348754251.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/bakukilemikorogebul.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/gawotewitixu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sl2e2a3oiefcki1tcatj65dqc0/dibozorofevumumetawiwa.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/vutimebazezudavexanobozij.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nedanuzumuvetekof.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/neponadelogonagov.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vatodufepusenexib.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepoguvimajizepok.pdfIn PDF document text
    • https://nyig.com/files/file/43065243478.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/tiroforodegowogesotipaboz.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/gedufilugutovirer.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904190210842675.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1384a4b97552fce05d90c706a6ac48d2/xozenimefoxinoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=notifications+sounds+download+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/22452354716.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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 14240 bytes
SHA-256: bf87a370b9ef489b81ec258fa1db0e6f448106de171602e1103b23665764fd9c
font_02_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10500 bytes
SHA-256: f042138976d6172d51eac94f3d32eb118743b3453ef411926b43c978d5ce9de7