Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f174e97fe8f4e1…

MALICIOUS

PDF

67.0 KB Created: 2020-12-24 10:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 18ee86f51a826e04c30935bb0e6b588b SHA-1: 190ad675c3ccac4cfaf72491930b28e15f37f0c0 SHA-256: 50f174e97fe8f4e1345985dd0bf448e9b51756d138276b0b5e9f4167063eaa44
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=talking+dog+commercial+bacon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f939d50ef35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5fa3dabca5df8.pdfIn PDF document text
    • https://sujozomamuv.weebly.com/uploads/1/3/2/6/132681492/2bd2fa1586af661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fb5dec3e67a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5fb3fa2700097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fc1bf93cdc85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd7c39e39c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_5fb948bc31ccd.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/geradi/gukolejo.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/cbse_10th_result_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/nororukovobelet.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/judazufi.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/4k_video_free_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf8dcf2-757b-4595-aa10-1a953afd2c04/no-no_boy_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffb2e71-3587-4a5b-8347-4a99df98c985/kaiserslautern_find_it_guide_kaiserslautern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2de928-f4ec-4535-9f46-68eaca1e497a/43299670964.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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 5232 bytes
SHA-256: 023bba1e9830ef7037b6b02b2c5d0d203b3866560b570360b1e75887d321bcd2
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10488 bytes
SHA-256: 1e48912a2264a619f39db4df9127d49752f13915fe6514f68561b7f1ac6869a1

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