Malicious PDF — malware analysis report

Static analysis result for SHA-256 198b746636620f4c…

MALICIOUS

PDF

75.7 KB Created: 2021-02-24 08:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86942842af10794d593c366bd1e5631 SHA-1: 83b832a1854484f483a1c6ba557387fb2a035ca5 SHA-256: 198b746636620f4cd1a4b205334fcc88bd79b870ea4798d32546d461e19b2263
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://seumenha.ru/strik?utm_term=amazon+echo+show+2nd+generation+setup
    • http://ruroraratotu.66ghz.com/new_dj_song_pagalworld_2018.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/0177c0324a1a049.pdf
    • https://cdn.sqhk.co/goluxewimabu/AifIifK/word_finder_scrabble_dictionary.pdf
    • https://cdn.sqhk.co/nakijalufiw/ejjnlaQ/tropico_5_tips_happiness.pdf
    • https://cdn.sqhk.co/wugunifikezu/aibicgd/1265346920.pdf
    • https://cdn.sqhk.co/towinomer/jaWaggu/xavuforunif.pdf
    • https://cdn.sqhk.co/nudabesawi/hhdjgx6/62064651341.pdf
    • https://cdn.sqhk.co/zusegekum/Rsiehj3/guardians_of_ancora_song.pdf
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/f98b15ad5.pdf
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/5651975.pdf
    • http://copalofa.site/input_output_tables_worksheets_grade_7evsop.pdf
    • http://zisilusekaxe.22web.org/brother_cs6000i_sewing_and_quilting_machine.pdf
    • https://cdn.sqhk.co/pujapipiwat/2gemgc6/office_story_mod_apk_android_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://babijegogaluz.epizy.com/56415797367.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fa.bin
e6539b5e07ef0d7c92ee71642ffa0afd44f8117ad83d066aeea96b97ccf66930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5720 bytes
font_01_sfnt_off0000fd5e.bin
81c8fa4d6999e4e0569cc58928bcc09f97676fcbc4211e31798102e9df1209f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 10700 bytes

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