Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b59bbce2b9c4ec…

MALICIOUS

PDF

54.0 KB Created: 2020-11-05 23:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4531ffa33c68d938d853f3c3b687c172 SHA-1: 98f53c7d762f74ad5a17a3d61fa824343869b213 SHA-256: 14b59bbce2b9c4ec93a764ea2c29b706218c084c5703c53fcf98dbbeeef5e80b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://traffset.ru/aws?keyword=kvcc+transcript+request+form PDF link annotation
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/netidopamaw.pdfIn PDF document text
    • https://namokokesovu.weebly.com/uploads/1/3/4/4/134480524/bolidusexanuket.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/5879214.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/9ce1849.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/6417054.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/8598858.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/3235999.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/bd1e89315579d71.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/3571584d-060e-476a-b22a-4b3607daaad3/propiedades_de_la_raiz_de_tejocote.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/behavioral_counseling_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4310046c-aba0-4f09-a80e-b58c03a87223/87020314979.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9EA4 25448 bytes
SHA-256: 546d275dd4844d0b1714d121200a21e475fe68396a35e14bd88191f88d1ba9f3
font_00_sfnt_off0000674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 5284 bytes
SHA-256: 18b94a16285d969b76a5a27c974d9a27600c165eb2f7553dd116300ef6ae17f9
font_01_sfnt_off00007941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7941 10936 bytes
SHA-256: de87af195bd17fd8f8347cfed66a6140da0e5e5a8b8396751b3440e7ffc44586

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