Malicious PDF — malware analysis report

Static analysis result for SHA-256 790ffd2b52582943…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 20:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bdd42f52d9e2910b2f92246f8559adf SHA-1: 34de78603e28332e614f0c14f1b2a03820a63bd5 SHA-256: 790ffd2b52582943b7d24d3965d0d5987f44024d088c1d8017f4c1389533480e
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. One critical heuristic identified a 'PDF_SEO_LINK_FARM' with numerous external PDF links, and another critical heuristic indicated a ClamAV detection of 'Pdf.Phishing.Trojan'. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=a+world+of+art+8th+edition+audiobook', which is likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=a+world+of+art+8th+edition+audiobook
    • http://fuxanujibiz.mygamesonline.org/cosmic_rays_and_particle_physics.pdf
    • http://pibakulisup.medianewsonline.com/sedgewick_analysis_of_algorithms.pdf
    • http://nuwazomesesanok.mygamesonline.org/bulletin_de_salaire_2020.pdf
    • http://vizilamu.22web.org/31176951055.pdf
    • http://lulamugateso.mypressonline.com/flower_drawing_step_by_step.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zoxewudunigus/36319405267.pdf
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_cc43921366b44585b6b6fdfff2687daf.pdf?index=true
    • https://s3.amazonaws.com/fekife/conceptual_physics_textbook_chapter_2_answers.pdf
    • http://lazubag.epizy.com/8th_grade_georgia_social_studies_worksheets.pdf
    • http://wikukodukoja.onlinewebshop.net/third_eye_meditation.pdf
    • https://s3.amazonaws.com/tixedujegibex/bapomazanu.pdf
    • https://s3.amazonaws.com/sabegokek/discovering_geometry_answers.pdf
    • https://s3.amazonaws.com/dazuxujepov/sad_love_shayari_video.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_f2cde0ccd6e44d2e9d329643350f3ac2.pdf?index=true
    • https://s3.amazonaws.com/tarajix/scrabble_word_finder_dictionary_free.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_5772c7962a504d14a6405008913b7760.pdf?index=true
    • https://s3.amazonaws.com/zasepo/47126417512.pdf
    • https://s3.amazonaws.com/warapagefasovi/jack_reacher_2_tamil_dubbed_movie_download.pdf
    • https://s3.amazonaws.com/xulepiwa/36005955844.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_off0000ec31.bin
b7422f575b0d8d0cecbe8893fd8dcfd5305f56f845412d6f08d619cde1b11243		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5296 bytes
font_01_sfnt_off0000fe41.bin
33bdd41c2b1d02ed2b22ac8b09ad1310a4eb816d3598dd609632192909a70daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 11616 bytes

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