Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac62896a591ad7a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 23:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e869f1a4e4ac7fea7a38a834d88359a5 SHA-1: d1bdbdc44d1335618553c9ee10286559cc9a6057 SHA-256: aac62896a591ad7a8f863124a96b40decadb1e235a1b27d211099b42e885e50b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the structure suggest an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=filmmaker+pro+apk
    • http://apisicul.com/userfiles/files/mikaligot.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69834789173.pdf
    • http://ddaengshop.com/ckupload/files/fefivuxaresuka.pdf
    • http://lexxyin.net/files/fckeditor/file/gesasefirulipubivudaz.pdf
    • http://mylivediamondinventory.com/uploads/files/67427080441.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/majabifexilasixugepi.pdf
    • http://plkorea77.com/ckupload/files/3396145093.pdf
    • https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdf
    • http://coolbiotech.com/upload/files/vafekatavawitedogaviw.pdf
    • http://goodlife88.com/uploads/files/49082588210.pdf
    • http://timebymtm.com/upload/files/loserikojev.pdf
    • http://vtvxm.vn/userfiles/file/giguvilakakazajezesor.pdf
    • https://serviceelectric.ca/userfiles/file/94956242235.pdf
    • http://gokea.org/upload/editor/files/kujeduzolojalavujugod.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/jufipofufaji.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/51558161174.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492adf49a---13209521226.pdf
    • http://geyuping.com/geyuping/uploadfile/file/2021091119514973499.pdf
    • https://taperagi.com/contents/files/remuxifokek.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/05195316337.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/tufovenajojuduvelew.pdf
    • http://reliancefla.com/admin/images/file/sapek.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142e994882cf---97404601315.pdf
    • https://duongthuy.net/userfiles/file/gifezub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000babd.bin
474fe5867ef9be41765f24b602a68469578b72ac10e77e897fae0b54290e2165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABD 17028 bytes
font_01_sfnt_off0000e678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
font_02_sfnt_off0000fe8f.bin
ab7fa426b4d00bbaabb98fe70c4ecb6e7c6fc596194f758109154cd8ec9f76ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10112 bytes

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