Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a2499cff594ae5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 22:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 768c83d7f4479c2f9bc37249f8940940 SHA-1: 0203831128db93ce3bd32fb42c27bb5a3fe6157f SHA-256: 15a2499cff594ae55935eedc760901203602a0ddd4744d9d0c1ae7cbcdc608ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to host many links on potentially malicious or spam-related sites. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=black+and+decker+auto+pivot+vac PDF link annotation
    • https://cdn.sqhk.co/rovifatira/bbicic3/vutikokiruwuk.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/possessivpronomen_tabelle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_6057a5c5bc189.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/injbgji/buxowajazeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6010d4df5ece1.pdfIn PDF document text
    • https://cdn.sqhk.co/gibiganegaz/X3jdgeX/mizexugasavijexanaga.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/O4Rlifm/49583540828.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/easy_piano_music_sheet.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/vogadufadakukifasile.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/86817471775.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/losafisapofozepi.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/26841267422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisonepegosa.myartsonline.com/97939278366.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/80269438413.pdfIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/29998183383.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/motivemininu.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/conditionals_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/79706787219.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/57925722241.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
    • 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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 5064 bytes
SHA-256: 88eb22be37b02b4909d98aee97a4663a62047fd60260c59580a03a0058361789
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 10380 bytes
SHA-256: 5bab1929cd002bfb1dbfad57d810bf509d991bea4938328d21e80948f45579b8
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 16076 bytes
SHA-256: 18344b64a226d109813ff392280c61da383d29fb6398ef2fae97cc1a212bcca1

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