Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f30d82f1faeb3…

MALICIOUS

PDF

80.8 KB Created: 2020-12-31 23:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e219ef35fdebade2a0c7a12420d9f3f SHA-1: 3d50766ade420620fcba52b1d74b2e794175f5d6 SHA-256: 8a6f30d82f1faeb3917785637fcbe2bc6c4685d086b5b7a21e574c6bc730f0d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=myprogramminglab+answers+java+chapter+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fbc84e08c735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5f97ab7157eab.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/zijigiga_besixapebuwun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_5faf8d81e5fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fe712e87020a.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/0dcjiAc/the_world_of_magic_guide.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/kumudo.pdfIn PDF document text
    • https://mazovibodekimiv.weebly.com/uploads/1/3/4/3/134398511/velogovudara.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/jivonobezizikapeneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fa942b75d745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5f93e72a24bc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2496aa7-3aee-4d0a-82a9-d8be7eba83a7/50731801856.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/96311717142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afc22e0-aadb-48aa-a0f3-6783ec25c71a/lokuropiposemitumekudo.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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 5976 bytes
SHA-256: 7e26dfd7fa73b8e2ea1533f0f8af14641d080f2cc4c5d70bc8273e7d65117a98
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11360 bytes
SHA-256: eb778834b5b73c07e37549f07d1e523b5d27b78c07b52c6a0d9233f2472c3136

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