Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59a47a88452170b…

MALICIOUS

PDF

68.6 KB Created: 2021-03-02 23:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 138e137baa5ee3cb14b1148008b23d1a SHA-1: e931be41698e55723ce1b92e3f478ace130c7734 SHA-256: b59a47a88452170b02f0061ea9eba3e31dcc410c9182fdeda3f45dc59c33dfd3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or redirection strategy. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest this PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

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
  • 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://dafemum.ru/strik?utm_term=conceptos+de+seguridad+industrial+pdf In PDF document text
    • http://mufutekuson.getenjoyment.net/tissot_racing_touch_manual_espaol.pdfIn PDF document text
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/xajunakina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fcad10730b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_60268105a6435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ffadb92193ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fff11511ee86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_6037b7fcf20d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_6007d30037382.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/bersa_thunder_380_grip_screws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_603443a7c39ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_602cadd698729.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/petubapizo/93255738319.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/xavaw.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/valizowuxigirozitapi.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/xevixulevesulixaxejesa.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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 5228 bytes
SHA-256: 04c6052c7c14c2958f6d36ac5863923e611948ef5882b4a76cec61ec923d2c60
font_01_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 10484 bytes
SHA-256: 7da4c67ad0018e2cd28a8c73562b845e4a70ad9735059b19713b57fa12ea89e2

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