Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fa1c4eea5bca15…

MALICIOUS

PDF

64.8 KB Created: 2020-12-06 19:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c63f986bf5ccc405208a8609730dfb17 SHA-1: b4a54aa8391b55522abd40aff72215d597f251fe SHA-256: a1fa1c4eea5bca1529e7da1db709610354d9cc58e40732ac4ce946ab4f83e7b8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/strik?utm_term=black+diamond+revolt+headlamp+battery+change PDF link annotation
    • https://gutilutaxare.weebly.com/uploads/1/3/4/3/134333879/52157f7c4d8d56b.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/2558046.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/welivug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fc9c9a12bfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f93e8ba6e590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fad9086c9ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fcb98655e556.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/2829932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f96c4b386449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_5fa44641dcc59.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/bidurudilidujug/roxy_camarillo_movie_theater.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/87841689524.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/green_goblin_glider.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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 5724 bytes
SHA-256: 31b4041f00b53625575fe29ff45d3950b0bbfca5665d710e5befb1f88c4765de
font_01_sfnt_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10024 bytes
SHA-256: 6b426460f2084211b4d291c6f825dccc8b5966f18ebeaf10e6160646cefff46a