Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af8367e3a98a246…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 13:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d11672232db7a8b3fcf7cb918926a028 SHA-1: ef3f43e5aba41538728fbf7af3fd17cd6b22f9e9 SHA-256: 3af8367e3a98a2462accff9169e0a3e8f4daa9b0b5e1b29879f46097fb81aefe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic flagging it as a link farm on disposable hosting, suggesting an attempt to direct users to potentially harmful sites. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ce8573c008ed57705a06384e5812f2c/48935160435.pdf In PDF document text
    • http://zae.me/datafiles/file/gugovowarumazamo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/50523494471.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/46343235363.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/tidawa.pdfIn PDF document text
    • https://arerp.kr/data/file///jidavowara.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/gigabuf.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/revejizo.pdfIn PDF document text
    • https://apra.pl/files/file/sozepesefarorijonal.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/bekikimaniziwefabi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zinebis.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/88408909196.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/44105446377.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/duwalidegusi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d773984c7---91015652176.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/remavesifakim.pdfIn PDF document text
    • https://akconta.com/uploads/files/dinofokajuvepudatupevuxa.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630736553.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zikugefoxo.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/93813558675.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/govaxonuxajiw.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tudazomafowoluson.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tagurogusigevimuf.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/679674954.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/pemipaporibigizume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dave+gibbons+flipfont+apkPDF 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_off0000b897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB897 16880 bytes
SHA-256: 4d42a7d4a8229235eb2378bb6b29eb95293eb4ad41b430ae5a3189f2edbfcd71
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 10732 bytes
SHA-256: 4fa641fb6de306a19c8561d3b40f3620bbeddb2931936587576b1f47a57960a9
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.