Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af68aa361037365…

MALICIOUS

PDF

68.9 KB Created: 2021-03-22 07:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2b78a54f7a54859006a1369cad44bbe SHA-1: 30c846b1609061a0e3fc9c1f9ccd32e69aa19f26 SHA-256: 7af68aa361037365f07aa911d7400a6e497630a522619a3fbaec2c20a6f02895
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 pointing to disposable hosting, suggesting a link farm or phishing attempt. The 'Nidhogg 2 trophy guide' text in the document body is likely a lure to entice users to click on these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/wix?keyword=nidhogg+2+trophy+guide PDF link annotation
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/fdf238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_60188877960a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_60197aa2d3b65.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/xixepotinazozinej.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/likojulidixo.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/5215582.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/2098549.pdfIn PDF document text
    • https://cdn.sqhk.co/farategibod/mP4HG8h/zukowizanizonebul.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/3ba6beb46.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/de703d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/fevubito/ggjhhig/kagugetewotosanowazupavoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_60184b3941dad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/extending_maternity_leave_letter_template.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_da2a4cebc2174030960eea8d4fa7949c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/polexukerurebakamujen.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_bcb42c1f58df448284f52af046548534.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/tizofibigavutamuli.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_2f74d9475fbf45c6add4b1f1225a1681.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_d958979e12054f99a945d30df04b404a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/bokarotusapijewabon.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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 5004 bytes
SHA-256: 7d1154eee4f4d659da42dca1393b3c4ac9ca3fa3d1c1b5f535c6e2f9db68d8c4
font_01_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10264 bytes
SHA-256: 951c2bc6e41aaf1d1682943da6045f4ce4e045432b4064c3303c5cc02ecc5b0a