Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3537350b960f32…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 04:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 610336b2305f45b36f36e4dea3228ebd SHA-1: 72b45473a517c65768d7bcf30f256af8a598eedc SHA-256: fc3537350b960f32bb69c56e4dfedff104b6c8620fbc7e06e2f1a564ce1a0111
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://zapcdn.space/web/img/podborky/files/zatimetupunamuve.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/karabep.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/83321252540.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///98663598622.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/jufuvisedosopozema.pdfIn PDF document text
    • https://aaaxxion.info/images/file/kewose.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/17852678619.pdfIn PDF document text
    • http://rayer.cn/d/files/tegezevorusu.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22206788278.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/patakomamiritugixogibole.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lulasetibawijirizewufilo.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/dijamujunuzakoletu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fijefi.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lexevibemawikafifuwiwan.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/86713718414.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/ditususigesenabanikox.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/63636121644.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/nipulafuzovigixewaboxu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zuwozawapap.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321942131a5---saduru.pdfIn PDF document text
    • http://manenshop.com/upload/files/84656242686.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/76573044960.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/tezaxadafezebogolem.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/20959316038.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/gititotasibakotuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jak+zrobic+backup+androidaPDF 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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10444 bytes
SHA-256: cb9f89208740773b48684c81213c28514acea15f7c28c4805d18ebe4a46cce42
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 17792 bytes
SHA-256: 85218ea1a70de5fcdeaee821a83f399ec3b27db483d01fb08744d257196edfac
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1