Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46bcc1a11199d6c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 11:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96a3f5ca780d2e22327c1f10bc4d87d2 SHA-1: d7494b2a5bc3c17b1b68bef0f9ac21ad894c28b2 SHA-256: a46bcc1a11199d6cc572c0cfa88c1178772adb4eac395b0e25bd322019832245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/123?utm_term=red+fish+blue+fish+dr+seuss+pdf PDF link annotation
    • http://tezoxefakalexo.sportsontheweb.net/stihl_ms310_farm_boss_price.pdfIn PDF document text
    • http://ecoterritory.store/8130346763483dhn.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/saxon_phonics_first_grade_worksheets.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/dr._berg_s_new_body_type_guide_free.pdfIn PDF document text
    • http://realwockyc.info/acer_aspire_e15_specs_i7qrf4s.pdfIn PDF document text
    • http://birubovaxed.22web.org/carbohydrates_nios.pdfIn PDF document text
    • http://uscovidcharts.com/rolling_stones_not_fade_away_lyrics_meaning1l9ub.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/iojuosK/27128587138.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/Nqie7N7/32207520945.pdfIn PDF document text
    • http://liketime.fun/virinuzubilowupisajkr2x0.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/aoac_999._11.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/ecology_and_environment_textbook.pdfIn PDF document text
    • http://lolkek.xyz/28948679157csutv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwosilavor.epizy.com/nuevo_diccionario_biblico_ilustrado_vila_escuain_gratis.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/pengantar_akuntansi_biaya.pdfIn PDF document text
    • http://pomadepoxe.epizy.com/ncert_beehive_class_9_answers.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/authoritarian_parenting_styles.pdfIn PDF document text
    • http://galapor.rf.gd/back_to_school_checklist_for_students.pdfIn PDF document text
    • http://sosefamip.epizy.com/66687529777.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/sesitogiwixifaxazukib.pdfIn PDF document text
    • http://malinaliwul.epizy.com/consulting_invoice_template_xls.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/absalom_absalom_free.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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 5068 bytes
SHA-256: 5daa17edf3ca4a73166c8a3e0ed6a30c4a76a6be27f0c446b5493faf986f8e6d
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16012 bytes
SHA-256: 54afe527bc7dd3fae2d9808941af685ec35f1abd6dff413bf73d138652c0b819

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