Malicious PDF — malware analysis report

Static analysis result for SHA-256 315c63bc00b7cca0…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 07:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0519eae321cfcf6746aef1e3102cd5ac SHA-1: 1ca8e9cf44665ebd20a2ccf4891c7ca16944a0a5 SHA-256: 315c63bc00b7cca0b70caba78d0298014275394379eb3550ca9561a2ca8e6682
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 'http://kofukev.rf.gd/55875720717.pdf'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a 'Pdf.Phishing.Trojan'. The embedded URL 'https://baarspo.ru/strik?utm_term=savage+arms+stevens+320+security+review' further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=savage+arms+stevens+320+security+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366645/normal_5fe5913188b54.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/b832cda37a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bb3774021b.pdfIn PDF document text
    • http://wubesababo.iblogger.org/36379537808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383573/normal_6001601972db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_6007e237d1335.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/xozasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofukev.rf.gd/55875720717.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/naruto_online_hack_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/lesobijodem.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/2649616628.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/wunivakukumusepanubuxot.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/38446562560.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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5884 bytes
SHA-256: 4dfe983fa4ea6bca0f04a34805e328dc7282d370a3d934ff19bc8d6c6f223e15
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 10476 bytes
SHA-256: 7862aecd7d63196549f22c6f02dcc82f9408869059e2df891f838ed0978e51f9

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