Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce99ecaeb949be2b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 13:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e6ad240d72b7b5c0cecd9f4aabee003 SHA-1: 2e524927abe263fee504b4ef04754c6bb74a43ef SHA-256: ce99ecaeb949be2bd6d04bfe93c3f46d30b07a180382a7a38389c81f4785ed61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing or trojan activity. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The PDF structure and embedded content suggest it's intended to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://flemingdecal.com/uploads/assets/file/lanogapilukenugige.pdf In PDF document text
    • http://kingsfci.com/userfiles/file/40617940961.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/77420690778.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331adbaed7e---19970876115.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/46898277102.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/pusadidafesawuwukodi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc2e6a3f8149185ef9cfcd5db662d855/rukukosikidabizibuj.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sopumirixolaxomexometamaz.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/tetuwaforiwuniniwipibuja.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/21647760111.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/jugikanuxad.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/nezofasoxujifafonurodegu.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/goxoni.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/loguxofasafibojanikef.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kokapatifiwusiw.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109050148028341.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/82195827467.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/76670964162.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/72851072678.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/nanejedogowegam.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/xizap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=phone+keeps+turning+off+with+full+battery+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pitajewi.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 17804 bytes
SHA-256: a8569f5f6e8dc4f71041f7cacff8aa6aa9acd896ab22e81275fec48abc0ff244
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 11312 bytes
SHA-256: 4d64c7960f4d8f0a4c44b08ee0bb020c5977a118d9ce4d036fa20df20aa4a415