Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0522e4ab7c47e2…

MALICIOUS

PDF

76.2 KB Created: 2020-11-11 21:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 490913bba5f87048b0d853b761dc8175 SHA-1: dc501effc7e60b810ed587b2e5d6c797cdd19c90 SHA-256: db0522e4ab7c47e2c6f52022da6773bb2e1cd915fc65ab67dd9d5c1f54368f56
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

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://traffine.ru/123?utm_term=jefferson+davis+community+college+baseball PDF link annotation
    • https://dojukigefob.weebly.com/uploads/1/3/4/5/134577696/famapusebixafega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f873b1bebe2f.pdfIn PDF document text
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/a845a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8ca08e377f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fac022646da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8887b511cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5f9bca1f3c6b8.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/jotizifime/banorijarusodabelis.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/character_and_characterization_animal_farm.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/33548022258.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/89574670947.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/disujilirogu.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/sobunigitunurulofuxepezed.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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 5512 bytes
SHA-256: 71cbab5c32f750347bc136cb590530d57b496e34dc9064f9db27c41fb9914e91
font_01_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 10128 bytes
SHA-256: dba993da4fda279cf4f0f5f183b6492dc80916384988bb2872192d35014a0904
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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