Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15654a89cb0a9eb…

MALICIOUS

PDF

92.8 KB Created: 2021-03-30 16:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d20dda5b84874afb34e17ff9a1e088f7 SHA-1: bfaf4022dbacae7ea85ef602ff578dd06ef46a0a SHA-256: f15654a89cb0a9ebfd9ab9b8db5d91b47a59315ca93e57328c8f07e85faab04e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified it as malicious, specifically a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=axial+skeleton+and+appendicular+skeleton+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fcb7b7b8be94.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/94437518715.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/pepur_vaxakan.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/best_way_to_write_travel_articles.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/ketoba.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/autoharp_sheet_music.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/mla_paper_format_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fff0413a9885.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/6124888.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/bissell_power_steamer_heavy_duty_3-in-1_manual.pdfIn PDF document text
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/9967502.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/time_series_analysis_and_forecasting_by_example_download.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/european_bread_recipes.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/xikogexadibukidukopakere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fd5f70e155d5.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/8167720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_60323b917c306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fe63007a7691.pdfIn PDF document text
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/a48c788b6e.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/gixirojozogufux/barakah_offshore_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/what_kind_of_battery_does_a_samsung_soundbar_remote_take.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/monitor_cardaco_polar_m200.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/39770631817.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/how_to_find_your_divorce_records.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/93527952250.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/oblivion_official_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/7531978578.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_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 5272 bytes
SHA-256: c5ffd00fdf1be7686ef3067f49f11d26cd057e18b867d1d8b726f086de2a70ca
font_01_sfnt_off00013dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFF 12008 bytes
SHA-256: 2cb7df89fe96b42acc84bd9125a91567fd157df32e8f3b0208578cea7b24cf31

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