Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb666f26fbd008b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 17:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9d1794445514aae120e047b4fa4a716 SHA-1: 373c17729bbefffb941bd365b8d34cb0466cbb62 SHA-256: 8eb666f26fbd008b6001edb66b90df503a504bc18ad09354a244f2497de4d545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs and the nature of the detected heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8772

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://crewmak.ru/uplcv?utm_term=present+simple+present+continuous+interactive+exercises PDF link annotation
    • https://foulardfotografando.it/file/31331728899.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bomuzavibafizekidu.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/4391258376138833c817bb.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/degoxatujelujetuno.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/bufijimaxud.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_212308.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/46295809436.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/dedupafiw.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/sinage.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210104436606.pdfIn PDF document text
    • https://bfull.ru/uploads/files/bemejapivarivoneri.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/nadudiguwu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/rozijijuzoxezisenisol.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f050ccbc---74749341513.pdfIn PDF document text
    • http://storemisr.com/uploads/files/futokoritaki.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/98808138729.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/86933608553.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10701680379.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/86704322593.pdfIn 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 18744 bytes
SHA-256: e51092e75463ceec4fc5f9ef110487d45573b18069f92a3178e4b21b8e0be319
font_01_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 10804 bytes
SHA-256: 951fa9970015d710fe776ab630045f2f4c2c2bfc5986f600a25e7f30c1669f5e

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