Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f753ef5ee59a8c5…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 12:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f618bd43aadf801eec74b1a036fcafc SHA-1: 34e8087b4461a0210f7d482e0907438a02d2ee69 SHA-256: 3f753ef5ee59a8c5bc1ee82d0ea9ea8a718f26558fa30d8dd43100c08b9a1d97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The presence of many external links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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://drafthe.ru/uplcv?utm_term=z5+compact+custom+rom PDF link annotation
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/55990498415.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/polaxulotagolifurexexujor.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/kukisadin.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/goledifuduvej.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/garulevobel.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/3295086202.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/98653904907.pdfIn PDF document text
    • https://ptogel2.com/contents/files/27749777557.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/20895011959.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vekamizefixazitixaxeguf.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/fekefagid.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/relukobok.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141909187c3b---xopime.pdfIn PDF document text
    • http://livestocktool.com/d/files/5290308311.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/56072781910.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q6562avr5fs7a313nj7tufv520/puwatevizanitalek.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/39366598694.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/153946523.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912221816.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wedarisuz.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/serixetugusojefejujire.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_off0000abc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC6 15088 bytes
SHA-256: 4230a7a7cebd480da115c7ac6560eeb8e38683bca76a8250b4179c4493d84e3f
font_01_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10356 bytes
SHA-256: ebf23ee60c34d7e1d49cc54ce3027db647e00cc3260425e0984c906ea50249e8
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1