Malicious PDF — malware analysis report

Static analysis result for SHA-256 798e44d83a47a13c…

MALICIOUS

PDF

62.3 KB Created: 2021-09-12 12:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfff7349c11a5fc7e76d0102629d6be1 SHA-1: 41114dd01ed0c6f50d2925ea53839d44bae56f71 SHA-256: 798e44d83a47a13cbdd92cd06edcdd1d24cbf4a9dc8407fc0c77dad983e3f5a4
124 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. It contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The primary purpose appears to be directing users to download potentially harmful files, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 4

  • 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
  • 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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba478ec196---nuzelo.pdf In PDF document text
    • https://jxlmedu.com/file/files/20210906_020428.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/2484233826.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/47760300198.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/68644612749.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/sebev.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb42d532b---18185938203.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/13893855671.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/86388169187.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/zoriwix.pdfIn PDF document text
    • http://4darchitecture.org/img/all/kuxavixaviki.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pavomonogusuvo.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/85391268595.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/duguvezafipipazuwiregajep.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zilojozepirin.pdfIn PDF document text
    • http://portableandcool.com/files/files/12115424540.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/49248056097.pdfIn PDF document text
    • https://satesayap.com/contents/files/15614143264.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/xusoki.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/kinaxiwukofu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/22791215967.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/jogezederigizefolabureto.pdfIn PDF document text
    • https://jss-moms.si/upload/File/96125270690.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5863243679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=go+locker+pro+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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