Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0b8d7b2e4fba26…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 13:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 037d08c1d15b9d121d3dfc7e94fe9dce SHA-1: 04f4842ee1561a8572afc08e5fa16e322fb0aab6 SHA-256: 5d0b8d7b2e4fba2646dd4414838f023525ff0afa802febd6db47cecbcf7f93b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest it is designed to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://steakpluspizza.us/userfiles/file/72961462969.pdf In PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/86126256572.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/luvuwi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/xivajarozemoselolofose.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nuvijinitenenib.pdfIn PDF document text
    • https://everestart.com/images/stories/file/53595791869.pdfIn PDF document text
    • http://stylekd.ru/files/dimasorapavise.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/nosexuvof.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/11102400797.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31326798873.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/jowivage.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210901_486CB8F078189F57.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/50573793447.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4a0c732d---mutakanofurawisel.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/d1600jsqmf91k5no2gorgoknpc/fosak.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jadid.pdfIn PDF document text
    • http://monyetmesum.com/contents/files/22346822773.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/22257055394.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/12445407427.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12282441299.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/samegepuzasuzemu.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pelivog.pdfIn PDF document text
    • http://kunbot.com/upload/files/lasotabax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+alchemist+malayalam+readingPDF 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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 10772 bytes
SHA-256: f1be3e565777f66cd554764e6938c6f61204266985db1661eae2d027a7c75579
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 21692 bytes
SHA-256: ff588da3fa96052bb908c1a71d615490e9bd32ff8d38b093bf4eb94d9e283bef