Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d79ad533b6769c3…

MALICIOUS

PDF

47.3 KB Created: 2020-11-08 18:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1f38149fd9fd2712832c3f04174f3011 SHA-1: 96b186db953a4a07055d6613ec0282a18c94d5c4 SHA-256: 7d79ad533b6769c32b188bc34d5e0155a47e380311202f41154e621e88ea48dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains and potentially benign PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffnew.ru/123?keyword=ojo+de+dios+directions', is flagged as suspicious. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links aligns with techniques used to distribute malware or engage in phishing. No scripts were extracted, but the overall structure and suspicious URL point towards a malicious intent, likely related to initial access via spearphishing.

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://traffnew.ru/123?keyword=ojo+de+dios+directions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f8cb94634c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5f9c708a2a7aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rejukimop.files.wordpress.com/2020/11/povarilurukix.pdfIn PDF document text
    • https://vetejijis.files.wordpress.com/2020/11/37430524209.pdfIn PDF document text
    • https://tugulix.files.wordpress.com/2020/11/dadofufapabakaxonawopodu.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/ensayo_como_genero_literario.pdfIn PDF document text
    • https://fiwanawid.files.wordpress.com/2020/11/pioneer_vsx_932_review.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.pdfIn PDF document text
    • https://zagedoda.files.wordpress.com/2020/11/program_manager_roles_and_responsibilities.pdfIn PDF document text
    • https://mepugen.files.wordpress.com/2020/11/65967984453.pdfIn PDF document text
    • https://zuruwetulumo.files.wordpress.com/2020/11/91358438925.pdfIn PDF document text
    • https://romekelisefo.files.wordpress.com/2020/11/nitunawikudaremutujozudok.pdfIn PDF document text
    • https://ruvujawiwubu.files.wordpress.com/2020/11/miguzumutenep.pdfIn PDF document text
    • https://luwoposafepi.files.wordpress.com/2020/11/61980660117.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_off00007ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC2 4792 bytes
SHA-256: e4195cd86f229285f42a6e82f34acbe154fb5054614b757df82b9e1ef0aa4cc1
font_01_sfnt_off00008b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B25 10944 bytes
SHA-256: 3d7918ff665c7abef4ad5bd897ae9c15e35697b74e1143abc38d56b3fc6eecfc

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