Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafd9b8f7d94b123…

MALICIOUS

PDF

75.0 KB Created: 2021-05-31 20:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: adf987e948cfd829922d531f521d1852 SHA-1: 23b8085117bb6e0ee6e7145f0b654db2f06967a8 SHA-256: cafd9b8f7d94b123a500506157e93b2e8aaaa2e295075727189ae544a1c5441a
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 0.9999

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://crysiq.ru/pbw?utm_term=lord+of+the+flies+chapter+1-6+study+guide PDF link annotation
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/logonurinadegub.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/95894df93fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6025ba030f5a7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4373983/normal_60b39f41295c7.pdfIn PDF document text
    • https://guvusogom.weebly.com/uploads/1/3/5/3/135324715/74c3c9268f90a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5fc6bfc39279a.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/mugopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453326/normal_5ff21644d2f7c.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/5366241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_603dd31f0a33a.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/fc1fb934-71e9-4365-a7ee-575e49279230/dujojedotomaged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a8735f-7b38-488f-bf4f-c701b46286b2/37994983009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb85a1c-c197-4120-811d-fd510e19d181/3547925427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3214204a-8b08-4396-b5bc-dc8ed905ecb1/risexalujeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40042cf9-01bc-43f3-92ca-1e4f6339f8c7/how_to_clean_eureka_bagless_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fde013f-608c-4062-8a63-283d6f37586d/dieta_de_zanahoria_y_papa_de._norman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f4e068-c69d-4134-8cf0-bb02b2fe47d0/biblia_peshitta_aramea.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 5700 bytes
SHA-256: 5e1f1bf985145f07b240b0adf046ceb2e8db5941f4104ffede107f2f0a17aaf9
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10156 bytes
SHA-256: 366b588c8a1cff0681257dd49b3ec6e0a93b3b660d79b36baa9e9fdb4f868b23

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