Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5423aeab312a5fe…

MALICIOUS

PDF

65.9 KB Created: 2021-02-12 06:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1f0e5618809a15758728784c115a1729 SHA-1: 94f82e7988a0bd844a15a0aef01c4e59038ab46d SHA-256: f5423aeab312a5febd1ef541dcbe9f08b3d5f1e08151450061c659a4d644c9f9
96 Risk Score

Malware Insights

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

The sample is a PDF that contains a large number of external links, many of which point to potentially malicious or SEO-spam related content. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to drive traffic to external sites, 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://jacksth.ru/wix?keyword=omokase+rancho+cucamonga PDF link annotation
    • http://help-mediasupport.com/4514339124764xdg.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/vesilatop-fitexamofamu-puzavibuba-kavevoxuzafonor.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/5970289.pdfIn PDF document text
    • http://pelososone.22web.org/utility_pole_transformer_wiring.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/3836281.pdfIn PDF document text
    • http://xajozixav.iblogger.org/opposite_synonym_worksheets.pdfIn PDF document text
    • http://wofomeko.22web.org/kannada_movie_audio_songs_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizifar.epizy.com/crystal_report_viewer_toolbar.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/avchd_preset_premiere_pro_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/66335776884.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/jurnal_aspergillus_flavus.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/niwofis.pdfIn PDF document text
    • http://gorevifero.epizy.com/fire_drill_report_comments.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/45482072825.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/ginifanevu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 5272 bytes
SHA-256: 1432d9a179d9e354f29dcea97cc1b2d957a1a9137fcba66b7299773b26439ca1
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 10336 bytes
SHA-256: 3abf3cb538ab7a9e39b916cd2bbc416b3901326a08132cddd8f71f55981c9465

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