Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e8da9b4f9e7f7f…

MALICIOUS

PDF

79.1 KB Created: 2021-04-30 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 339c50fa75fab3d24a95d2ff8d549f7d SHA-1: 3eb61f8add72410ed3cc737727444731e1bfb1a5 SHA-256: 27e8da9b4f9e7f7f6e554efd2a8f0d6a3ea8c5aa714c2f2b29e724a2a319d009
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be a link farm for SEO purposes, disguised as a crossword puzzle. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links suggests the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=crossword+puzzles+online+free+uk PDF link annotation
    • https://cdn.sqhk.co/rizikodeni/hjjadgf/rubasumita.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/9iYOggO/ranusofaxadewegafizufom.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/geijvhf/lajisozemotexavipebive.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jXhdsgg/arena_of_valor_switch_dead.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/mijvhiM/1weather_weather_forecast_weather_radar_alerts_app.pdfIn PDF document text
    • http://mebesovinu.22web.org/mekapamotuwegaved.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/dgrWuG8/13449840071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dadojusox.epizy.com/noaa_climate_change_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/canoscan_lide_220_manual_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/80086507881.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_3efacbd2e8174e3f89affdb39c25b0fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/3711548261.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/97994950518.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/construction_of_genomic_and_cdna_library.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/ronovodonavijod.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/aadhar_by_mobile_no_and_name.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_10fab88224494084b5b35701a06d1191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/density_of_metals_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/hd_wallpaper_for_pc_nature.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/fifoniwazelesozefabi.pdfIn PDF document text
    • http://tavopaku.rf.gd/saranelazobuz.pdfIn PDF document text
    • http://zizokeb.rf.gd/does_stretching_help_relieve_sore_muscles.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_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 4936 bytes
SHA-256: 1b729fe81ef89ffd5e8771fb35f59bbb4b57371a4bebfe7e079a412f3ff07b08
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10972 bytes
SHA-256: 03b61f3afcfeb41ca177d985a03e9d2cedc774d85be652cb1082c55290b78a97

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