Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9bfb334fc59e81…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 17:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e0231a3e5fc7ebe3f36c8f30918ffad5 SHA-1: 96981c90406407c3852fe1f6b7ddac95bf0d8f30 SHA-256: bc9bfb334fc59e81e3c0870211307042fd04a88f25eac469325eaeabc3efd41d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Kerr model of curriculum development ppt', aiming to trick users into visiting the malicious domain vilenefex.ru. The presence of external URIs and link farm characteristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/aws?utm_term=kerr+model+of+curriculum+development+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fe99d4bc6a8c.pdfIn PDF document text
    • https://revotifolalowo.weebly.com/uploads/1/3/4/7/134716495/dumevewozepesako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_60222a70ebaa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_60323df424f7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5ff765c6380f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fe25be6af41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_604edad08fdaa.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/abbc489f3615996.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/bejage.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/tirafitivekuk.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/7782329.pdfIn PDF document text
    • https://pefizisiguxuv.weebly.com/uploads/1/3/1/4/131438819/4512249.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/jifesu/bizosubokaki.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/zonelebalez.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/84377292882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053e4cb2-8b9e-4d34-93b6-48c6df5b366d/72875091143.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/progress_report_example_in_technical_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ce9327-7f75-4a39-834d-a0621888322e/dunilitiperibazoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14d009e-d5e2-4e27-afee-c9b335265c6c/20417292530.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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 4944 bytes
SHA-256: 36ab0eedb02d97c09c4405efa63ae316b05b4b93d3239f53f81ff83f02a3bc11
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 10564 bytes
SHA-256: 2343c6020e9351b470ff1cd0d6db073c7c30f36a1d9c48f105ab9d3712f7fdb1

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