Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0823740d4b61c4…

MALICIOUS

PDF

54.4 KB Created: 2020-06-08 00:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 120f84ae749f0647bad86b03059891ac SHA-1: b99769ae2a90bec57218220dc7b0976e225fb7a7 SHA-256: 5b0823740d4b61c44c20ab803ae65c1c3bf9accbe9aba767d55f2ea25425921b
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary purpose appears to be directing users to a vast collection of other PDF files hosted across numerous domains. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest a potential for malicious content delivery or SEO abuse. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://modernsteps.net/uploads/1/3/0/5/130550971/8bc59.pdf
    • http://realestateladiesrocks.com/uploads/1/3/0/7/130739165/nesatovuruzafujofuve.pdf
    • http://webdisk.jlrodgers.com/uploads/1/3/1/6/131637496/duzutu.pdf
    • http://steel-line.net.au/uploads/1/3/0/9/130969032/fugosar.pdf
    • http://smartchoicecare.net/uploads/1/3/0/8/130813784/siwusimojafom.pdf
    • http://yourvirtualbestfriend.com/uploads/1/3/0/3/130323209/2018279.pdf
    • http://mx.desargues.org/uploads/1/3/0/4/130479044/df898.pdf
    • http://brandontelesco.com/uploads/1/3/0/7/130776085/vasumuwedobime-foxupetidi.pdf
    • http://nmbt.co.uk/uploads/1/3/0/7/130776514/miwifi_wasugewum_zegupozanata.pdf
    • http://mx.donnasdressshop.com/uploads/1/3/0/3/130313783/3349357.pdf
    • http://autoaccidentlawyerswtl.com/uploads/1/3/0/6/130622077/6568137.pdf
    • http://oconeehills.com/uploads/1/3/0/7/130775431/130775431.html#%25D1%2582%25D0%25B0%25D0%25B1%25D0%25BB%25D0%25B8%25D1%2586%25D0%25B0+%25D0%25BD%25D0%25B5%25D0%25BF%25D1%2580%25D0%25B0%25D0%25B2%25D0%25B8%25D0%25BB%25D1%258C%25D0%25BD%25D1%258B%25D1%2585+%25D0%25B3%25D0%25BB%25D0%25B0%25D0%25B3%25D0%25BE%25D0%25BB%25D0%25BE%25D0%25B2+%25D0%25B0%25D0%25BD%25D0%25B3%25D0%25BB%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25BE%25D0%25B3%25D0%25BE+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D0%25B0+50
    • http://oconeehills.com/uploads/1/3/0/7/130775431/130775431.html#%25D1%2582%25D0%25B0%25D0%25B1%25D0%25BB%25D0%25B8%25D1%2586%25D0%25B0+%25D0%25BD%25D0%25B5%25D0%25BF%25D1%2580%25D0%25B0%25D0%25B2%25D0%25B8%25D0%25BB%25D1%258C%25D0%25BD%25D1%258B%25D1%2585+%25D0%25B3%25D0%25BB%25D0%25B0%25D0%25B3%25D0%25BE%25D0%25BB%25D0%25BE%25D0%25B2+%25D0%25B0%25D0%25BD%25D0%25B3%25D0%25BB%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25BE%25D0%25B3%25D0%25BE+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D0%25B0+5
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fowavorag.files.wordpress.com/2020/06/14786681016.pdf
    • https://malavuk448953849.files.wordpress.com/2020/06/bujede.pdf
    • https://momipeneji.files.wordpress.com/2020/06/xoduxuzixezuxurebimo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009827.bin
1f443a5b0711026d43c9f2a6403ed842588f58ede0e28de517c75576bd6b3bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 16076 bytes

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