Malicious PDF — malware analysis report

Static analysis result for SHA-256 2480dc307e6d4cfa…

MALICIOUS

PDF

75.7 KB Created: 2020-12-11 18:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 655d935b2e1c59dd09455cf3f172b499 SHA-1: e24d4d0b4847cdd829062afaa23342c0d3bec9fe SHA-256: 2480dc307e6d4cfa245e415109865bf9093608f6a84ec7722d3cef03d534c88a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the primary external URI points to a URL related to job interview questions, likely a lure for phishing or malware delivery. No scripts were extracted, but the overall structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://traffine.ru/aws?utm_term=job+interview+questions+and+answers+in+spanish PDF link annotation
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/ea9f6c33c9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fd0402f317a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f8c1e9fce6f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dobesogum/56537606673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e464ab09-028d-46d3-abf1-cd9a0af6a8ce/rumawowurapupoziguri.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1571bc30a162e0c558f21/t/5fc424993c6ccf69f3e17789/1606689946965/puwonevovulanul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884d3c56-d273-412f-b795-4d9b694e0736/rizigovuxod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0efc3b8467722f1d478d1/t/5fcef1175562961561460e88/1607397655825/wefajegunisuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cece58-297f-4c7f-89b6-fd5da561be5f/daily_oral_language_grade_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 5304 bytes
SHA-256: 023eb66a429a257e203dbe97b7a709cf50f9f456293955bfec09ba9eecc14992
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10228 bytes
SHA-256: 8feef94582eb4024c5f62ef04db47bbfdb4d73bd5c1ab84d7668c1929e2c06af
font_02_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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