Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1914c85137edee…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 01:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4eb1611a43a6244e2ef2217cbe4fd652 SHA-1: ea5bccd68ec5c0922d082c71c788eacaf21e532d SHA-256: 3e1914c85137edeea0d2c34a20f1cc466d73a4dec1d25beb50e28d126c53bd04
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-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.
  • 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://vilenefex.ru/strik?utm_term=new+testament+bible+verses+about+tattoos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5fd75d32752d8.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/castrol_edge_5w_30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fe8c47566836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6027f87c45e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fed5c73625be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_60260a2c17170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5fda89393e401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_601b00f10d312.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/0d41e352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_60051843af8cd.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/9e094acb7dc84e.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/what_is_sociological_imagination_and_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ffdf595568b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulopekusape.atwebpages.com/21175392528.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/hp_laserjet_1320n_wireless_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/30340989633.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/96947674804.pdfIn PDF document text
    • http://sonarubitexo.atwebpages.com/gizoseximugudi.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/rental_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/pozawojagapujusow.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/67201411834.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5092 bytes
SHA-256: c3d58cff3f2e350c1aac4413d28dc41c861b2658aa8240a9d2ea969deea9679f
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10792 bytes
SHA-256: 4e31e987b6fc602a9f29b0b3cb1a7215f939232cdb03784bc8effbd651088fdb

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