Malicious PDF — malware analysis report

Static analysis result for SHA-256 02551b47373b4895…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 17:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79dcb03c38d02715801fbecc3ba7806b SHA-1: 5f1f76fce9bd1cf654e669d757e8445763234870 SHA-256: 02551b47373b48957ea3082505094aab5a51e83482d800435aad23fc7bb7ccef
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 pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://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_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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