Malicious PDF — malware analysis report

Static analysis result for SHA-256 9351e148f0717edd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 23:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87d4436224eb397c60361c2583f5c28a SHA-1: 595a42f86ac6b18d7bd01965a5761909d2df7a79 SHA-256: 9351e148f0717edd1b79cbe58fa040392052c0d0f00fa95ac20f1020cd36f8af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one specifically pointing to 'allytemp.ru' and a UTM term suggesting a lure related to 'minecraft horizon client'. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The presence of many external URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://allytemp.ru/uplcv?utm_term=minecraft+horizon+client PDF link annotation
    • http://progettogeometra.it/userfiles/files/dosovowelerenimof.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/30332189566.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/tadozitejotemigemerewakud.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/rukatazazis.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/mugewedez.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/27744663381.pdfIn PDF document text
    • http://www.bash.cl/media/file/9239399291.pdfIn PDF document text
    • http://eventechsite.com/files/files/vifagunu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557358d2586---84862552439.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/78048231837.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/946008121.pdfIn PDF document text
    • http://wamer.org/userfiles/file/rebadedemaxatusebiruvave.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/20911907754.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/bujuzosodokutu.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/tekomuwekonuwedoradakunex.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/9236064881.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/72834437283.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44eae158b---96848432975.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/52356965373.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/16665400535.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/28714485511.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/23724170012.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gegolijugamibim.pdfIn PDF document text
    • http://elitacasa.it/images/file/57810669526.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/20419089190.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 17360 bytes
SHA-256: 51677763708dbed077b91ca89678cab3d3fdedf5c8ffa332cab2fa03803368a8
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 10316 bytes
SHA-256: dd916555e799331acc0f8c5d533a14be3e8ab19d64cadc37b61299041a45daa9

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