Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3ac0a29ca6e965…

MALICIOUS

PDF

67.6 KB Created: 2020-12-16 13:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c89b8683610cc20a0def2e20ec99d78d SHA-1: bb0163cc33c7ec19b23e74aeebf3790f941ca661 SHA-256: 4a3ac0a29ca6e9651ca0887f3d903ab4e1dad8d8e88d265c2ebb614a01ca827a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'virtual lab punnett squares answer key'. The presence of multiple external PDF links suggests a link farm or redirection strategy to distribute malicious content.

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://traffmen.ru/strik?utm_term=virtual+lab+punnett+squares+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5faadd24a89cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f959c50ea232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fd1c362a16f9.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vemubeli-zesoguseboxe-segusotupiw-turatoxadaniku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fc920041ecf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fd1ee8e52cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5f9acd8300e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f9e35788a4ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6092e537a05ef08bc6e/t/5fc1099e1972c46e3cc33dfe/1606486432035/dadobaxarodatokakuze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3696f7848ba205d2893e8/t/5fcd1c4283d2ac65cc1a3c1e/1607277636464/unicorn_dash_magical_run_old_version.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54c3ec6d96458363f293e/t/5fcb934eb6b7366152fb4e3f/1607177038475/54054162809.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc645f12e537a05ef2d9efe/t/5fd6daf396ed101a3e52d4b6/1607916276356/danoditomorelanirowamof.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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 5304 bytes
SHA-256: 449b755d260542e63b2352769091149ea4c92ecefc98fbe01cf2f6a9367e5ff1
font_01_sfnt_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 12236 bytes
SHA-256: c88106e4639cd6143ebb35af5449f74ac087fd80364a222cc4d4d75a550b4bde

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