Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba16eef7142e2b3…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 18:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 849e875d76522a92c745f703248b0370 SHA-1: 7a8ffde6decd5b181cf317b1576fce0371a55b02 SHA-256: bba16eef7142e2b3261114c4e3824ce86f619d4713ae92257094b2e8564b6dca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's part of a link farm on disposable hosting. Numerous embedded URLs point to PDF files hosted on various domains, suggesting a campaign to distribute multiple documents. The primary attack pattern appears to be luring users to a collection of potentially malicious or SEO-manipulating content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://gestionarival.com/userfiles/file/birozolukidikuveneva.pdf In PDF document text
    • http://livestocktool.com/d/files/57902778569.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/99988857381.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/98997304398.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/50857833949.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/85286485415.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/kaxomomutafil.pdfIn PDF document text
    • http://safarang.com/basefile/files/44027809370.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tevifas.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/43853247452.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/88402199738.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/55429027102.pdfIn PDF document text
    • http://licausi.it/userfiles/files/matisewisumuzubom.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vezetutifiji.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/vegematigupenamisavowewe.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/85510502064.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2egtufr4j3evtrvujb0hkn3fea/13911446790.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/90316822542.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/pajiwavalotububizowu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/zimugobupo.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/10712974139.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/pozerakunuper.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163064914195813279.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/86459343767.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/zidamag.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630632370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=where+can+i+watch+coralinePDF 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_off0000c095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 10240 bytes
SHA-256: acb8af655df9e1e1338e1841c7c269ea20ad20b5bf12827cc71933c930dbe279
font_02_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16760 bytes
SHA-256: e387f9a32e379e6d9742f0be48413943ef9d94ba963015027dfef18d70813514

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