Malicious PDF — malware analysis report

Static analysis result for SHA-256 0279bde68c19ed6e…

MALICIOUS

PDF

86.5 KB Created: 2021-04-06 07:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940a28706c3cddfb1474dde5c61f29fe SHA-1: b14f36694f0ef5f459278b2fb43920a873787f54 SHA-256: 0279bde68c19ed6e5345fe45e12d56b9468258b0001592aeed99afad1d3cbdb5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('jacksth.ru') that is likely part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, potentially for SEO spam or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=headband+of+mental+prowess
    • http://rusadezebep.mygamesonline.org/how_many_chapters_are_in_chronicle_of_a_death_foretold.pdf
    • http://jotitojimo.mygamesonline.org/jilepepuwenozuz.pdf
    • http://julivojurukumu.sportsontheweb.net/79397874271.pdf
    • http://zigijel.22web.org/boomerang_bag_pattern.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/past_simple_affirmative_exercises_perfect_english_grammar.pdf
    • https://s3.amazonaws.com/pidufozu/history_of_chinatown_new_york.pdf
    • https://s3.amazonaws.com/kovilowab/roluzuverani.pdf
    • https://s3.amazonaws.com/salosibejodod/purevebunojud.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_1492d7067f9847c39468458f5c263b85.pdf?index=true
    • https://s3.amazonaws.com/pizexopenaxu/autocad_free_2016_version.pdf
    • http://fotolen.epizy.com/prueba_libro_barcos_que_vuelan.pdf
    • https://s3.amazonaws.com/feseni/android_version_update_app.pdf
    • https://s3.amazonaws.com/pegebunov/financial_signal_processing_and_machine_learning.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/arkham_asylum_a_serious_house_on_serious_earth_analysis.pdf
    • https://s3.amazonaws.com/nazekisigiduz/toyota_auris_2013_hybrid_manual.pdf
    • https://s3.amazonaws.com/gifiz/89787912061.pdf
    • http://xedemigu.atwebpages.com/plot_diagram_example_beauty_and_the_beast.pdf
    • https://s3.amazonaws.com/gebukil/pirates_of_the_caribbean_r_rated.pdf
    • https://f0d491a7-7d72-4eea-bbd3-72ad31f48a9a.filesusr.com/ugd/1acdab_ec0a7a2c65d0486f9471ec01388c3083.pdf?index=true
    • https://s3.amazonaws.com/runuzitexokol/25624138292.pdf
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_152af626a6434b9db219c6c160fe7692.pdf?index=true
    • http://nejuzuwesikodik.rf.gd/74722330915.pdf
    • https://s3.amazonaws.com/sinadi/telugu_dubbed_tamil_movies_2017_list.pdf
    • https://s3.amazonaws.com/memobofilenabon/fuzotoliketoduso.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_off000113b6.bin
3f2b4b479a6bd329b901af6f077b9960de6ffa9ea0378f168e3f740eee206dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 5380 bytes
font_01_sfnt_off000125f2.bin
24de1ffd262327faa20159a6a87fb9ca6d2f27e0bf7ff0b3700811e254c70864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 11576 bytes

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