Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac86f0b23c2f003…

MALICIOUS

PDF

71.5 KB Created: 2020-12-23 15:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 198e34dc519427f688a30615e7c4fb65 SHA-1: ef86e357e6eefd2eaa2243cb8ac281461a2df336 SHA-256: fac86f0b23c2f003525c213433ad153ca7f0489cf85fa966b2b15bd5059e4a59
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and a phishing lure, with a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URL and the document body suggest a lure related to 'Minecraft mini games unblocked' to entice users to click on a link. The presence of external links, including one to 'trafftec.ru', indicates an attempt to redirect the user to a malicious site, likely for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=minecraft+mini+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fa95ab8c148c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f9c57591b7a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fc582badde39.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/wadibonazejaru-binupuwitidulib-razobegumodin-buveririreni.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_5fb2a9829af58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5fa1eb960411c.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/fidefofudi/acid_base_neutralization_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/nigerian_christian_praise_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/beechcraft_c23_sundowner_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/21252360091.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/social_media_marketing_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/fairy_fencer_f_ps3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/zanegetiguta.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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5548 bytes
SHA-256: 4348a24e42a9fe44c84439958a0c2005e2b5110b5ad24d42baf2aa88bae8c83f
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10596 bytes
SHA-256: 0a274344124cea518f66f1e10e2352503fe1ec64b9bd4442a8a2a668e1b9cff7

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