Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e6538f70eec1cb…

MALICIOUS

PDF

76.7 KB Created: 2021-06-05 21:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6468c6af7466ca17e670e6fdcb81412a SHA-1: 2151e94dbbdb8cc00b1a2897ec4375ec6930fd76 SHA-256: 14e6538f70eec1cba0cf0adb077f0f126fa418cd8f72d9476413d38837f64b5c
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 0.9998

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://kuzutuzo.ru/123?utm_term=c5+envelope+printing+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383567/normal_604006e62ac40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_6032039fd3c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_602c648e17faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419451/normal_5fdf7243457e7.pdfIn PDF document text
    • https://benuwefijazom.weebly.com/uploads/1/3/4/8/134897428/3a5e8c.pdfIn PDF document text
    • https://surafevigenirax.weebly.com/uploads/1/3/4/6/134610600/03008d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fc7991220ae6.pdfIn PDF document text
    • https://tivofemexire.weebly.com/uploads/1/3/4/0/134012880/af2aab67858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_5fd91d1d6e933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_601c8cc871609.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/80df4b77-52d7-4734-9e29-60edf23a9b8a/how_to_wash_semi_permanent_hair_dye_out_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84022d5f-492f-4723-b657-491a9268f840/berurovipiwekuvituw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad3e235-3557-45f3-803b-b5d7b94127fa/90313058300.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144418665/58265098320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2537b4-9a05-43f5-bc8f-6ea65e201e31/niluzafiketowogosofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da18dec7-5ce6-4c45-907c-79638c78f835/83548555767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c600d0-b62c-4b02-a4ce-fe2fb5c089df/23574574838.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/47416882353.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/20794819110.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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 5280 bytes
SHA-256: 08bd6cff451ea8eef1a2d8cb6381e5581c103f4b46bd156d54f193ba2a21458b
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 10480 bytes
SHA-256: 74cfa91377d3b3b24a11692a288fba451bcdee2d1062b5ef486c69c08598fe57

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