Malicious PDF — malware analysis report

Static analysis result for SHA-256 0731f1e624746032…

MALICIOUS

PDF

75.0 KB Created: 2020-11-06 18:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e68f4cbcdebeda675ac064057e2ecf0d SHA-1: 1cec4828cd8506fd15a59d1727e7f8e89acc3c1e SHA-256: 0731f1e624746032f8d683f2c2f1397f412f9a5a21c6231079d9b13fa454eb1b
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL 'https://traffset.ru/aws?keyword=rca+rtb10323lw+manual' and numerous Weebly-hosted PDFs indicate a pattern of redirecting users to potentially malicious content.

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=rca+rtb10323lw+manual PDF link annotation
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/8f6b5d39e6c7af.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/198eb.pdfIn PDF document text
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/pogub_pirovudidu_marofira.pdfIn PDF document text
    • https://jinukomerum.weebly.com/uploads/1/3/4/5/134587773/kafofomolubewol.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/55f11f7cbc87.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/ritan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5bcf9041-1f5a-4e80-a866-767b9e8d241d/mitchell_middle_school_racine_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3219c15e-8d68-4500-a25d-e80c1a547ebb/wavoxipuzewixu.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/beginner_sight_reading_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e151571-6c78-48d5-9eee-61795e905f94/jixurakafi.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/kutum_vs_nouver_mystic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2732c97-b768-493a-bfc7-7c6a241a2a34/online_auction_system_project_in_jav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 5100 bytes
SHA-256: b47e2f760ef207ba4429120e705f095e51f6e0feddc411723ef66df5fc94f9f3
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 14160 bytes
SHA-256: a1ee7edba373d9e1fc58e8638eeeae0541288f18d9d0998ef195e7f2696c0dff
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 16164 bytes
SHA-256: 1b988e2d2c4c0a08d3f2c9d13907455689307c3667ff908b5836ff62b1fa9bb0
font_03_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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