Malicious PDF — malware analysis report

Static analysis result for SHA-256 413685057ece5546…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d4e44b44585c1836f519a87ec3b6e34 SHA-1: 5bbbd250cb090a982c5b11329402a63ac72a3b8f SHA-256: 413685057ece5546b3994d62d23618b6683ecda2ca13d6d4e3afbe90d4a6229e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a tactic to distribute or obscure malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.yemany.com/yemfiles/files/xefuj.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///48853086937.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/47375556045.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905175117.pdfIn PDF document text
    • http://cycling-software.com/files/file/19351836979.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/15943082449.pdfIn PDF document text
    • http://konberdbio.com/upload/files/movojagavevidediwi.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/mixoraxemebelebogazole.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/44831522346.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/21791576559.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xuwubamazaz.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/fesolodolenobatavux.pdfIn PDF document text
    • http://beta-rc.com/upload/files/nuxebujogeje.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/86370557697.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/78821451428.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bivujumoreko.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/76851428784.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/lebusukejeremuzoze.pdfIn PDF document text
    • https://verner.lt/images/files/20210536657.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/16656858292.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/937dffe39643ff8edc56bda9c1257cae/97941659563.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137a06d29906---senif.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905211349_lpone9.pdfIn PDF document text
    • https://bawauang.com/contents/files/91628956515.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/52849265263.pdfIn PDF document text
    • http://rivucota.com/upload/files/48791450660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hack+hill+climb+racing+2+iosPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 17948 bytes
SHA-256: f5910514554ea470b417c2007522b8a751d158cf80bd3b1a8a898f05551226d2
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 10788 bytes
SHA-256: 91eb14c4c67b20b6f7114304f0f2108cdbc8f36870c989a7bc9beccb8d1cf873