Malicious PDF — malware analysis report

Static analysis result for SHA-256 54797d9b8857c021…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 10:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 17e3dfe0d62f8dc487bec66f61bc4d46 SHA-1: 99a37eb37f730a34dd062993f53abc3d4b829bb3 SHA-256: 54797d9b8857c02168ecd376ce0dc8a0e9709f3cf0edc9591b6051c8671dcf3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on S3 buckets and appear to be part of a link farm designed to improve SEO. One prominent external URI, https://ponafet.ru/strik, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=stanley+300+amp+jump+starter+instructions PDF link annotation
    • http://gazagidumow.mygamesonline.org/78559077896.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/vedimu-jigize.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/1402155.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/nirizaneg.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/tipos_de_atresia_de_vias_biliares.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/81346934381.pdfIn PDF document text
    • http://mokugujumekov.sportsontheweb.net/catabolismo_definicion.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/ruxobafut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divikufifir/luzugamunogiwamalevipoga.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/accounting_salary_guide_australia_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/hamlet_1996_movie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/nys_homeschool_quarterly_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/california_dmv_disengagement_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/bioterrorism_act_2002.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/kogafukadezotixajidiri.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/name_the_allotropic_forms_of_oxygen.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/saddlebag_lake_ca_fishing_report.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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5664 bytes
SHA-256: 58f156745c6b5886f22e02bc6434f339cc0cc63473d098179a249b5d4f3b5569
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 10876 bytes
SHA-256: 1b755203bf92ed9b4caff4253848e9ce53c758bfceb7b115ca6e3f2dad43b996

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