Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c7d399bcf0c00d…

MALICIOUS

PDF

77.5 KB Created: 2021-02-15 14:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a5cee2ee753e0f1263813a207b5dfcd8 SHA-1: a0d5865923465c9f8962da6bb056fbb24ed2af9e SHA-256: a2c7d399bcf0c00d76ba1c5a98dca0d7b3a596bdefe3472ccdaff2fe525df521
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are identified as part of a link farm or redirect to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to potentially harmful content, possibly exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=worksheet+on+dna+rna+and+protein+synthesis+answer+key+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fed9db532839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fe5d85f90f26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5fe044e3bb6b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fc6f37dd81c3.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/4c548.pdfIn PDF document text
    • http://shoop-fo.ru/garette_s_revenge_piano_sheet_musicd5ups.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5feb0191b98a1.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/178bdb97b499a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_601c8e57a2814.pdfIn PDF document text
    • https://bosewumakujo.weebly.com/uploads/1/3/6/0/136036310/dc1eb385f31e023.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/4331268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fccd7533b507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fea3a609d987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5fdab58ac6724.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/gelawiweza/apache_spark_2._3._0.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/1822609911.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/castlevania_symphony_of_the_night_ps4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/sofupovikikef.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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5368 bytes
SHA-256: 4eebe1c1b217fcaf42775011e272272c460f0b7a2b1d616aa7c283b4620382ac
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10160 bytes
SHA-256: 8af07b388ca26e5d6433fb5a7e83cb230eb315c3de7310cee0eb483f9f68ec2a

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