Malicious PDF — malware analysis report

Static analysis result for SHA-256 afeb387587e5dbba…

MALICIOUS

PDF

78.7 KB Created: 2020-11-20 01:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b8bda4f26c5650b3d7e748352b210c6d SHA-1: 1d8594686a392ef1823ea10d491f84783055f953 SHA-256: afeb387587e5dbba26df4efcde2334f63cbe9ca432c41308801ff95eed435834
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=toc+toc+movie+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fae3110299d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f9b80bf2d1a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f8a0bbf10c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fb255914b01b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_5fae3da378847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f8c891b7cbdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fa53768e6eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5fa61fcfa91f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f8de91ee2cc8.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/2278369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f89148b9dcd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fa2a2df63397.pdfIn PDF document text
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/3857755.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/henghuili-files2/ratojenosarej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73142184-0e4c-4cd6-81d4-7a3055a0185a/18696213407.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gefovufekumupegijusofexi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 2984 bytes
SHA-256: 38ca3b7717b5a46e42d38c146003ebf3fa5dffce7ddc3c5293ab3aa0d8f1f646
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 5024 bytes
SHA-256: 785098a00b8c1b1ee826773befa7c8f021e60e27415181ea392c21b82a164f32
font_02_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 12520 bytes
SHA-256: ec31f446aa03ae2e94781eb66b119b3b97dd6b52f1037159d30614ba465a0ce2
font_03_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16076 bytes
SHA-256: 97990adcc91a1e334b404002f9a6b356dd0e0e66c9193a0499481f503a30e292

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