Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8ca442b7752f4…

MALICIOUS

PDF

75.2 KB Created: 2021-06-08 22:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a74ca8a6226def4ce3968550834219a SHA-1: 05e7ef0615dfb00157ad4934ff4d95c1711e0f91 SHA-256: 8ff8ca442b7752f4172f32e02c086ca8f31d555bb2b09c2332e1c2b68a142a47
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://crysiq.ru/pbw?utm_term=reading+comprehension+exercises+intermediate+multiple+choice+pdf PDF link annotation
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/1b903.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/kejadipezof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_601061e39ac7a.pdfIn PDF document text
    • https://dinufipaxa.weebly.com/uploads/1/3/4/4/134440308/tesesimewobumesaneme.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4382620/normal_60b3f1ea3c7aa.pdfIn PDF document text
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/f052ce3df70a890.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/jukilex-gojokonanuxeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fd1e7068f88b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_6022d3fc634ef.pdfIn PDF document text
    • https://nixoferijoxe.weebly.com/uploads/1/3/4/3/134373865/lebipifizibif-rijufubuj.pdfIn PDF document text
    • https://verisawexixisa.weebly.com/uploads/1/3/7/5/137507423/toviwadoberefejoriw.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/bewigeboto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6043e58e383ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_601a148b6f021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6044f4b3acf8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixulirulafa.pbworks.com/w/file/fetch/144495753/89305736060.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/w/file/fetch/144688692/95043573130.pdfIn PDF document text
    • http://vikiruji.pbworks.com/w/file/fetch/144685533/gazigirokorojisuxikox.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144562938/el_gran_grimorio_dragn_rojo_wikipedia.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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 5644 bytes
SHA-256: 733200b7aed4ea7e77514e49ead23e37a42d2cd7a38f4c75a7e8e6517ff96fdb
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 11016 bytes
SHA-256: 8c91b73e6e8777aad4b406f749db4a786ea7fd85e6efe443df5e98ea0d155008

Open this report in the interactive analyzer, or submit your own file for analysis.