Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe8de42f92edf3e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-23 18:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed418811bacfae7e122986f0074655b7 SHA-1: 923d27cd6f6a9731006eb32c22945d74e2d77a8e SHA-256: 8fe8de42f92edf3ec9ac4959b74e2dd0757fa165d8e7d87e25bd8c16c47aafec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://baarspo.ru/strik?utm_term=verbal+reasoning+test PDF link annotation
    • http://itravelgr.com/funcion_del_sistema_endocrino_y_sus_principales_glandulasbsg0t.pdfIn PDF document text
    • https://cdn.sqhk.co/vivokunavu/uicyvWj/degosewedulujorenatiz.pdfIn PDF document text
    • http://uscarins.info/vibulerimitobafuuf4xn.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/42887742812.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/ee2DP8X/ancient_empire_strikes_back_up_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6053aa7864389.pdfIn PDF document text
    • http://twirlini.com/how_to_change_time_casio_telememo_30qbyp1.pdfIn PDF document text
    • https://cdn.sqhk.co/fozozumaj/eBgfhaV/50190169432.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/69240129100.pdfIn PDF document text
    • http://dvestideyli.xyz/what_is_the_difference_between_the_char_broil_infrared_grillslxq8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_60436b907cb7f.pdfIn PDF document text
    • http://namelesssouth.xyz/azur_lane_san_diego_guidexkddx.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/tuvibogutavijijukun.pdfIn PDF document text
    • http://zozifufo.22web.org/apa_style_article_critique_example.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/85266602401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaguforijovu.epizy.com/zebabonugetav.pdfIn PDF document text
    • http://wonetone.rf.gd/65654765215.pdfIn PDF document text
    • http://ximolamerojizud.epizy.com/cholesky_transformation_in_r.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/substance_abuse_in_south_africa_youth.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/nukusegomeviniw.pdfIn PDF document text
    • http://tisimutugixaji.rf.gd/me_before_you_full_movie_download_480p.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/quimica_organica_john_mcmurry_8_edicion_descargar_gratis.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_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 4960 bytes
SHA-256: aa0b6f9de529b51bef19335ee2a3f5d0c5b42fca2d4c8483fa55c56685a01857
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10664 bytes
SHA-256: 10ccca1ef7c7e38a5dd1f7db8aef361b53eff9a7da9fd8df59957e159f8fdeac

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