Malicious PDF — malware analysis report

Static analysis result for SHA-256 b642b20696eb9ffa…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 14:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 549ae02b8f03806043b74ab16d336826 SHA-1: 788fe4f0329c93309946fc93d73c423877412852 SHA-256: b642b20696eb9ffa96988d0180efbb5e87526971493da93419badddbb27ccd7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=watch+seven+deadly+sins+season+5+online PDF link annotation
    • http://geoass.eu/userfiles/files/45491336488.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/2555252122.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/45456889268.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/govudurad.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109031816189313.pdfIn PDF document text
    • https://digireg.es/upload/ziwosamuxofa.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/92673992395.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/wosupodirezixogeve.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/tubokorijesusujukobuk.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/27ef981ef2fb8f7a21613fb23fc5cf8e/zejorobasizoxuzoxigixuso.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/xajegopefijunonak.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/53344233966.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/66322027949.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/defatepajolugupewu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bifatejuwaputanek.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/powipebesoneduzitobu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/55133565120.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gepigovupoma.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aenepjck4cci9f340oai2qjtk4/96174850422.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/54772615516.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14468080342.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/duminitogor.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/94574677414.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/31452785130.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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 10672 bytes
SHA-256: a4d29d4e945dc35239ba063dab8655ed95701c443550f67aa7f1d249b99fd5ed
font_01_sfnt_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 16300 bytes
SHA-256: f3517609c58774fc51d43d8a6766457805313afab57ad0dd20638edf896b61ed
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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