Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c3dfd6232303c0…

MALICIOUS

PDF

74.3 KB Created: 2021-01-30 04:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 954d6802cad5c84d3b212a5242a6bac8 SHA-1: dba5ba071c6908cc9d69f358e7b479f772cbd36b SHA-256: a9c3dfd6232303c0492ff072265257af3619c4d52d3d952928b5a45e2c259393
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 as a link farm, suggesting a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or malicious content distribution vector.

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://jottigo.ru/aws?utm_term=papilas+circunvaladas+o+caliciformes+inflamadas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fee019f667ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5feb57ac5671b.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/51f0690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5ffe6723db2e7.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/2296769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5feb80eeb4ece.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/8032245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6012c27171ea2.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/tesuliw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5fe0dcb3a2661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcf01d090dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_5fdc0cca93808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_600809be6cf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_6014bad051149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fc98b6acf3aa.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/wovugi/tufodapenujalovipojiv.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/du_sol_date_sheet_2018_bcom_hons.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 5364 bytes
SHA-256: ddc6f234dc936dc7aab62192ece0f4a1fb1d0ed1f4912f2e8cb22080cc1aa0e5
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11192 bytes
SHA-256: e75ea8e5d8fe2aa699d638b8ca96c42105fee0b86533b05321e7079e21b7b0f3

Open this report in the interactive analyzer, or submit your own file for analysis.