Malicious PDF — malware analysis report

Static analysis result for SHA-256 630715285e63e83d…

MALICIOUS

PDF

76.0 KB Created: 2021-05-28 07:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ea0f1ad0e22977e850ec49d509e9b0ad SHA-1: 5fca01e2c9d7f38e7f9528cda98f33f00f9fb709 SHA-256: 630715285e63e83d1dd2fc0a45f532fbbecd3e536e6419b6f80155e93b3e3079
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/123?utm_term=pc+browser+free++list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5ff1969689fd3.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/2994654.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/mafudo.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/a9545aff59c.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/1116005b70f.pdfIn PDF document text
    • https://burubigek.weebly.com/uploads/1/3/4/8/134884838/nopewadek-misediputizurow-fabogobomun.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/287e3.pdfIn PDF document text
    • https://livafuti.weebly.com/uploads/1/3/4/6/134628119/57597.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/duzilupanelowokudud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_605f598d50e6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff69ea10a81d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5ff96d5357396.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/36686d5e-197b-4145-b15d-a61f4d13013d/zudeliwexotovugosafit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8c554f-695d-4c6c-b916-7777fdb3ce42/how_you_spent_your_summer_vacation_write_an_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b0b7f2-e1df-4e46-a62e-389534effd60/21642465152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c216f8e4-aa34-446e-a72b-9cdbc76a5c58/a_touch_of_class_hair_salon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec2381f-f948-436b-a114-9436d3179a80/examen_de_primaria_sexto_grado_primer_bimestre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a548eb-01b3-4a35-aa29-47f06f399c24/2289310368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a416c1-1f6b-40e3-b48d-72c9b5311e4a/92885488527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d133cb62-c3e4-4b7c-b187-105f1be58f59/zugubonujutifefamarif.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_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 4896 bytes
SHA-256: 97790c5a51d44cbb88d9ba271b7850c6ac9dde90cf1f2a013b6d429d5da2090b
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 11000 bytes
SHA-256: aed7635e1679eb4986b29f529cb97fee611165504be32f629f955fb7be7b600a

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