Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c51bff4ed05a1ff…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 11:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 47ccf471312d91024f827f277b69b27d SHA-1: fa9f417063d318a83f785d207105547d21a8d6f4 SHA-256: 8c51bff4ed05a1ff15aacc1a1bf1661d571ef52e518f96bd430ea90780e672c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zgic.ru/!upload/files/jeniparumajufiz.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/kupaxerex.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62978874752.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2721393688.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/papuzori.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4b522cf3a7cc1b9f42caae8108655491/zuborilena.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/89984336292.pdfIn PDF document text
    • https://hiroyoung.com/data/files/97707197142.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904124447.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/23028182013.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/remujigukapuzatamuwonos.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cf01f5b9---51999427730.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/79999143876.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/zosurajevadanenijeva.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/fejuvonunakuxudafitisi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090217484480554.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090421460282.pdfIn PDF document text
    • https://hobbypet.cz/files/file/41297907954.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/93958114547.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/1840460990.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/menov.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/76081596110.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/12671872984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=joycon+droid+for+iosPDF 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 19020 bytes
SHA-256: 1a54c834f78f65a506295f802b9b8eb496c043f9f6af51075a339fa3552b4c62
font_01_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10136 bytes
SHA-256: 66f0764732a107f92e7fa7553d0d96f8a362b8787cea39ff35580ce35c4f7c4d
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1