Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36a2c0360afc783…

MALICIOUS

PDF

100.9 KB Created: 2020-12-11 11:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e33bff4a92cac0298f0bf4b0a6cc8f62 SHA-1: d84c420ec886c90bf0893525b5047726e8f77a8d SHA-256: e36a2c0360afc783ae13b813ce2a686bc7f8faccfda88c77d3fc36847e7d171d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=unblocked+movie+sites+on+chromebook PDF link annotation
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/3393351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fcd0fdaa3d91.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/7943218.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/kesaberesopesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_5fd2faf1e2fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f872fee4ac92.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/sepezusit.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/2945446.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/5fc66592affbf90a66102224/t/5fc88184094cf7617dc2c472/1606975877064/mini_long_haired_dachshund_lifespan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf553ca97599144eee4ae3/1606374718158/linevajefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730dcd9c-3634-40ff-bbca-8bbe53fe0f49/rock_mechanics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc298325e8e827d4298aebe/t/5fc3ab76f81c9a2a0c123bf1/1606658936181/branford_public_schools_superintendent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaf0c63-da1b-4f44-8a71-e3490baa4699/physics_equation_sheet_a_level_aqa.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_off00014d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8A 5224 bytes
SHA-256: 2ee0c71397fd124ccfe65135b79dc44cad228e0e58deae93ed1ee9a4d542afbf
font_01_sfnt_off00015f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F31 11644 bytes
SHA-256: 9e2a800d71dcb6d718c1b89b2673bb3ff8a390a1d24fd5add02e1f9c39bf029d

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