Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17ad67918af4a03…

MALICIOUS

PDF

78.1 KB Created: 2021-03-26 07:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3fde8cdb35dda8184fc92a48d9e11f SHA-1: b8d9b85ccfb9bb6d03eecfb342c41fe856656e6f SHA-256: b17ad67918af4a038fe86ec496313a341f4ac84ffd96a6f2a05e1a50eb93e0ad
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, disguised as a walkthrough for 'Super Mario 3D Land', likely serves as a lure to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=super+mario+3d+land+walkthrough+world+2-3
    • http://vomamafawib.scienceontheweb.net/backlash_full_book.pdf
    • https://cdn-cms.f-static.net/uploads/4372373/normal_6059712f9a858.pdf
    • http://povulofi.mywebcommunity.org/duwaj.pdf
    • https://static.s123-cdn-static.com/uploads/4451035/normal_5febf141d97a1.pdf
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fe31f423d9fa.pdf
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/dukonerupe_muwatadav_fixufixuzar_lipexuxoxewaler.pdf
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5fe529d82d474.pdf
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/92d65bf5e84d46.pdf
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/09d1d0c85.pdf
    • http://wusumomijo.medianewsonline.com/standar_nasional_akreditasi_rumah_sakit.pdf
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/543f4eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ligiwekuxote.myartsonline.com/apologize_piano_notes.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_768ac49b17c24350a67ac10290b5df5b.pdf?index=true
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_146f1464bc074e74954631616ba6d411.pdf?index=true
    • https://s3.amazonaws.com/xakusineba/tevitekiwenojusas.pdf
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_ba46c9a7f3db4d8eb6e25f8075086f10.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/aima_gdpr_implementation_guide.pdf
    • http://doxokalisawe.myartsonline.com/home_brew_beer_book.pdf
    • https://s3.amazonaws.com/gawabog/tarikewivumolifonute.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin
240161aac7c009c279372886c4f721537b164d2b9be493c2c96d39d2ee4063c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5780 bytes
font_01_sfnt_off000104cb.bin
c337044e8fbffe5a142fb59d8b9caefd6416582edb2623b1dd4916db488d71f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 10748 bytes

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