Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1176d741b71234…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 12:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5612966f01413b6456a1e73ce4c9d740 SHA-1: d2dd8d7b1166ce25bafa70bf4fa99ecf1fb96917 SHA-256: fe1176d741b71234bc6f15ead34d157e952410580cab57d55bb08d6f73c76305
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm, further supporting a phishing or malware distribution motive. The embedded JavaScript is the primary mechanism for achieving this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://roycraft.ca/userfiles/file/88990862057.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vujpdi133cht08ojeihj5v4ncp/siriruvajik.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/84521500197.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/vuxixeb.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17640335051.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/naketiji.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/eb538329ac049e680d9c676b0c99e028/tojediretake.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/tasar.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/voludojipemu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/goxanoxalazavadepilo.pdfIn PDF document text
    • http://ranchobg.com/img/file/veseguwuxakonom.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lofepiledonozaxe.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210902191812.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/75720219278.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/zulekuxelifedaposumugew.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/59576334795.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/xilijibuliweje.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904123036.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23441492932.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/17892414537.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210917223033.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/ruxedawunowogetewuwe.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/lipitedezoxi.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/sawinebe.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rutagaxejerenoku.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906162113_d602bt.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/66286036997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+pokemon+on+androidPDF 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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 10556 bytes
SHA-256: e641ef9099b5fe73e66d96520a3dac78b82fac04d99714e7bac4fc5fc5b5f42b
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 18244 bytes
SHA-256: 4f1c57e25036dc688b8803745e96d5145c8d9b5cfba1d93c967f1065db5d29f8
font_02_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1