Malicious PDF — malware analysis report

Static analysis result for SHA-256 137956b300912e3b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 23:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85e53e5fadf6943f15703b0d3869b039 SHA-1: aca71923c0b2dc2f74ef3e71d1335eceb53c5c56 SHA-256: 137956b300912e3bc4b4659c24a9ceb89fc1aedd51548a2c9183e7f0c5eb8711
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is likely used for phishing or to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=android+java+vm PDF link annotation
    • http://kisito.com/userfiles/file/lojunilovaguvakadiranoka.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/86908231100.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55853736642.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/lufakarunixabebumuruwofe.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/rakojoxekali.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/kiwagotoderuxesovuzuk.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/ranoxogikoxigozefepabef.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6c90d73377c10f7dc7ca8efc25090394/86646990281.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/pelosasaririwitasowuvinoj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aea82bb68---konegidevazis.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/52172375638.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/36026538486.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57262045554.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nifalarejuzelumojugi.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/jugofe.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/77474501838.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/6584777265.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/83952716655.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/25478106304.pdfIn PDF document text
    • https://zzwgjx.com/d/files/veralovene.pdfIn PDF document text
    • http://airfa.it/userfiles/file/62103721932.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/15676618753.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sajifinupizepifo.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://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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 18764 bytes
SHA-256: 8be89d9a2f16e4a1ff473dc5cdfa992baa1c41177c9b3045f88936ab240e2dd5
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 10144 bytes
SHA-256: 706d40d06cacb96b0c7dd7116e2418e4ed1265fe94f3011026316f50b816a79c

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