Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7e2afabeae8ab7…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 01:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ece3d992c5c047f8162bda563518b009 SHA-1: ccafa8c51f92796fc2fe41e1effa0a615043fb3a SHA-256: cd7e2afabeae8ab7202b392b7258d1e599e1355a9a86daef84bbe9c22d91fb0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=real+english+b1+grammar+pdf
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ff80c29b7195.pdf
    • http://aslixan.com/42744744785mkovm.pdf
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5feb96be86981.pdf
    • https://xonodomewavewa.weebly.com/uploads/1/3/5/3/135316089/2489052.pdf
    • http://findssldz.xyz/sosiparitjrbd.pdf
    • http://reduslim-shopofficial.site/kinds_of_pvc_pipe_fittingscsl71.pdf
    • https://metelegib.weebly.com/uploads/1/3/1/3/131380803/1481782.pdf
    • https://vokaratux.weebly.com/uploads/1/3/5/3/135335958/baac73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_3396cb0d6c474fb09996e4ce8ed1a7a7.pdf?index=true
    • https://s3.amazonaws.com/muvarelo/showbox_android_phone_install.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_5c67077d9574476faa37b17ffeea9584.pdf?index=true
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_06ccd2d38c5a4809a7c7db2c379a81d0.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_797bde3ec2724904853ddd6adfecde3e.pdf?index=true
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_4288d7c3b681439888ed8c5c6bafc2d5.pdf?index=true
    • https://s3.amazonaws.com/mubefula/ansible_2._4_rpm.pdf
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_fa988c700c7244829ae910819ffa31f7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf54.bin
2b22e42ba2304ac5d3a5182efec2117eeb929453efcdbf84ceb6ee4cf043c26a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 5656 bytes
font_01_sfnt_off0000e267.bin
1df693bd9c62a055fb3ef60d7fb504a3618dd323fc3756a610d71ff39d430681
pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 15888 bytes