Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4099cb36fcb5331…

MALICIOUS

PDF

73.2 KB Created: 2021-01-11 12:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 003e17438ef96c4afcf490f4431a07a2 SHA-1: 0db0f105c80c33c5625fbd5bbccbb8d20c9456eb SHA-256: d4099cb36fcb5331c88e43d8cbd8dd7c72e58ebaf0a1bd263bde8f831ef25cc1
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The primary malicious behavior observed is the embedding of a large number of external links, forming a link farm, which is a common technique for phishing or redirecting users to malicious sites. The document's content and structure strongly suggest an intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=correct+email+format+example PDF link annotation
    • https://cdn.sqhk.co/godivago/hggcjao/final_fantasy_vii_remake_gameplay_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_5f94c07ab01ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcb65c065692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fc4f9c16b81f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fbc886329575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5f8fc441877cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_5fbfb28817551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fcb32c82e90c.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/2898657.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/bomifabipi/surface_area_of_prisms_and_cylinders_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/73516352292.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 4956 bytes
SHA-256: 1acbafc754c7919032ed5bc585abd8bfa86b8d9dcb32d22bcdc2c811340b7511
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10992 bytes
SHA-256: 691390a127943191b5fd2aa3dff664ef13e68f4b229399fc14571c14d9baca0d

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