Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac9daeca6726669…

MALICIOUS

PDF

76.3 KB Created: 2020-12-19 22:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 439f62f794af8e057d18d9e723d8f728 SHA-1: e92d17e59aa4c4145313332d163be3845dfdf7a6 SHA-256: 4ac9daeca672666939d7424235534a9e4a44a50c43241543442a37dfe54560e3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://trafftec.ru/aws?utm_term=android+room+migration+didn%2527+t+properly+handle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fd708f91e260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5f93f28ced998.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/6310844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5fa336a8b42a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491153/normal_5fc3ec5e82dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_5fd63e0f8584c.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/meberu.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/fejififimaketo/85385237103.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/lebeneraramiwizewekat.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/primer_of_public_relations_research_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/wastewater_engineering_treatment_and_resource_recovery_4th_edition_download.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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 5320 bytes
SHA-256: 943c2fbe95ba6a3849b8bebe0855a18b1eab3b53a2c5a83aa2848f00079a0bb6
font_01_sfnt_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 6888 bytes
SHA-256: 57911583379784f572ce81f7c3cfbab9ec40313b5a4e80c9c7b8535956624cfe
font_02_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 11568 bytes
SHA-256: db268b22c12193eecb3d0c23dc3df2d006f7bf179522b22e112451e8d25c9f5b
font_03_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16512 bytes
SHA-256: 7da5b45dbb85454eb767991a065b7d14d8a0d705bb9f309fa00b9cde6b41bbb0

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