Malicious PDF — malware analysis report

Static analysis result for SHA-256 af54eb7007d64f7f…

MALICIOUS

PDF

60.5 KB Created: 2020-12-17 01:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 61898d0781004a7a65da744824aba03b SHA-1: e9dafde92a38569d08c2dad59c35e59e66a1430d SHA-256: af54eb7007d64f7feedc8ba50f10cf3b22860c85fde7e37191ef25286f040444
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious external URL. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://trafficel.ru/strik?utm_term=funny+in+public PDF link annotation
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/juxakenulamug.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/5136282.pdfIn PDF document text
    • https://minibimegoviw.weebly.com/uploads/1/3/4/3/134333268/zizomobutev.pdfIn PDF document text
    • https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/damuxanil.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/junejun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91fb592-582b-4e14-ac3c-f76e06443a3e/romewafizunulefe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe005418e72e5fdb9d43e7/1606287445363/tofufudewit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf736ccb-cdea-498d-a15d-09c3f491398d/the_colony_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/probability_generating_function.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/fuzavozilavoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/battlefield_2_revive_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc31ae93485235c862ce369/1606621940191/ropefarovaleletus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fe68ba-c1e5-4fbd-ad9a-566cc0322bfb/salujesofedexedeped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b18ad0-5e2a-431f-bc49-e0ab5f4568a1/27235346980.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/belajar_trading_cryptocurrency.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/58116490488.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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 4640 bytes
SHA-256: 454d2334d4b582d519aa5dc19b6551c840bd636f64a23626c8b499a3dc0a7f67
font_01_sfnt_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 9948 bytes
SHA-256: 276ce74e37d62391e0928cf052526f182c227409fa417266fcec4e4660ce01ce

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