Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3398257dd05fcc1…

MALICIOUS

PDF

77.2 KB Created: 2021-05-28 23:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d45e27e9dc22f75aa22c7ab2a8f3c4b SHA-1: c3d665e087425eacc82e04f6575ed71580a349f3 SHA-256: f3398257dd05fcc128d99edcc6bc9fa1ad2bac0077ca0bde293d8ba30da2453d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF files hosted on Weebly and other platforms. The primary URL, https://ponafet.ru/strik, suggests a phishing or malware distribution attempt disguised as a Star Wars sourcebook. No scripts were extracted, but the extensive link farm and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=star+wars+d6+imperial+sourcebook+pdf
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/5100953.pdf
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/wunepidopemuvan.pdf
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/afa9f643ed66.pdf
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fd62fef1eedd.pdf
    • https://cdn-cms.f-static.net/uploads/4457590/normal_5fd99f95b86fc.pdf
    • https://cdn-cms.f-static.net/uploads/4378857/normal_605907d8adea1.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_600cfb43f095c.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60115399ad90a.pdf
    • https://static.s123-cdn-static.com/uploads/4403804/normal_5fcef7efed835.pdf
    • https://xafuraworeduvux.weebly.com/uploads/1/3/4/7/134752052/riresodo_mazulitonatat.pdf
    • https://static.s123-cdn-static.com/uploads/4384045/normal_600109e02c87c.pdf
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fc6731f3be42.pdf
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fec7a2d67492.pdf
    • https://zirawasapawati.weebly.com/uploads/1/3/4/8/134878995/bujewisapupenofu.pdf
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/wawixemi.pdf
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fec158839c84.pdf
    • https://kulaxebide.weebly.com/uploads/1/3/2/3/132302774/7438394.pdf
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/bd728c154c2850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eff2.bin
3b3554f62cb82063a041acbe1a0294df5a1a4e359f273a918aa161736cff4fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 5852 bytes
font_01_sfnt_off000103d6.bin
a6e9921c70b371662051aca31c0ab2a1b54c7ba84b36eeb451e96403fb4081a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10548 bytes

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