Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b98174766efc963…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 15:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da47b6e25d22009933265fd642b07a89 SHA-1: 2f47752bb9d37435ef59c3c7c956efbff83c990f SHA-256: 8b98174766efc9637a8425b5a8e282fd3e5a7a7de9770d17e5c958f401924883
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://jumiwimov.ru/123?utm_term=adblock+android+root+apk, suggests a lure related to adblockers or root APKs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=adblock+android+root+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60212995c22ac.pdfIn PDF document text
    • http://dressnbuy.com/mini_lathe_machine_for_sale_in_pakistan91nro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fee7065bcc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_6017bf63a85e8.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/xurojovegumavevafi.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/1d42994b73fffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_60281342341a8.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/05e7e9c42d.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/7452889.pdfIn PDF document text
    • https://pigoresaj.weebly.com/uploads/1/3/4/5/134589591/dc6b5fe907b6.pdfIn PDF document text
    • https://zaroralovez.weebly.com/uploads/1/3/0/8/130814195/visasel.pdfIn PDF document text
    • http://predouche.xyz/interior_designing_jobs_in_bangalore2yqba.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/zaxet.pdfIn PDF document text
    • http://static-start.top/zigakijoguvugiroymswg.pdfIn PDF document text
    • http://investmag.org/architecture_portfolio_powerpoint_template4xq0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fdbe9067ec98.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/muxozuvalubi/63335743198.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/how_to_reset_netgear_router_wnr2000v3.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/making_music_74_creative_strategies_for_electronic_music_producers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/wukipizazetemirizobol.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/creative_certificate_template_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/nakofux.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/ace_ventura_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/how_to_play_munchkins_game.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/england_netball_beep_test_form.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_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5084 bytes
SHA-256: fa3828224f93d79f6dd662a80284a2a23bedf7d8db5789cbbc57eb3e628978ee
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10580 bytes
SHA-256: f0fe591e5a4656cad60ebc99532bc6ec0d0f6ee20bcf09e7c8d73dc0c8fd2c8b

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