Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc430cb6967c5b5e…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 16:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a30c860c0aa483602affa1a2d10608f7 SHA-1: a0ccbac59c15b1ffd2b52542d5ac38c877816f84 SHA-256: bc430cb6967c5b5e12d81b57fdb97c31d27584962dc078135749509a8609801b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be related to salary information, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://druttle.ru/123?utm_term=masters+in+business+analytics+salary+california PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486351/normal_602e0e34636f8.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/71c689d13a2.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/geYjd8P/zejinovuwelelezomedi.pdfIn PDF document text
    • http://mesretly.xyz/394128698843zfd8.pdfIn PDF document text
    • https://tezulitu.weebly.com/uploads/1/3/4/3/134316961/manunilutamaxos.pdfIn PDF document text
    • https://peziwavadeba.weebly.com/uploads/1/3/4/3/134313506/5383550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018335710d68.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/783de7a0b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5ffac6958247b.pdfIn PDF document text
    • https://cdn.sqhk.co/paxelababeg/hmEhal0/ice_cream_frozen_banana_cocoa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/pefesiwiludigepepesubake.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/43909718469.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/43711856121.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/timozubir.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/corolla_nc_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/42992700028.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 5124 bytes
SHA-256: ae5c95635354432637ca8b44cb8c583e2fe1d12842b05d115fd59cfe78cb1583
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10996 bytes
SHA-256: e2a1ad9a769d4474bb485d2a025a35e8c79b45b2ccbd3b35e8da3d33f2e245aa

Open this report in the interactive analyzer, or submit your own file for analysis.