Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f1e5bcc4150c4a…

MALICIOUS

PDF

66.4 KB Created: 2020-11-13 18:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 96b83cf9877550b94801e7c8af07e939 SHA-1: cf216728f7d566b4d6c588f47cb126ea275991ec SHA-256: 20f1e5bcc4150c4a60c655e5a0c604638980c9f90d2546590a5eab35e86c6b65
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The malformed stream length heuristic further supports exploitation attempts within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trafficel.ru/aws?utm_term=cbse+topper+answer+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fa2de5a3ab5e.pdfIn PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/f861d2052fee30.pdfIn PDF document text
    • https://rexolofozex.weebly.com/uploads/1/3/4/3/134368018/besot-fedufawoxizaj-redesivos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f4939a177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8801108406b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_5fab19d6a9f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5f9e2b6f06d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f87055be4cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fa92ab792c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5fae0c68d6295.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d33b987-671f-41f2-aa95-9b6ebe40e28f/xunonewotezi.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/17838892968.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/dichiarazione_di_conformit_impianto_elettrico_cantiere_edile.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_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 5236 bytes
SHA-256: 823bf0f9b27933002f83009bd647e2bae8e24fff5bc509888f51ab7b3a7f798a
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10324 bytes
SHA-256: 7a42ec1b8a6519effe87fa6a81bd382db83575b6a431f347300a279ce72c88ec

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