Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e78e736d3d179e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 18:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e786d764e2338b90f4336a2325ca95 SHA-1: 1bd9771e1a8ac0eb4b8be89c2547e2aa1c0f00ce SHA-256: 58e78e736d3d179e7d3eb0f927dedca7825d1ce5ce20b429abcf2b177116bc40
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which are part of a link farm, suggesting an attempt to direct users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chungangroup.com/uploads/files/202109120517269057.pdf
    • http://alnoorcity.com/userfiles/file/nejimoxozuretelibej.pdf
    • https://nhahangbienhaitien.com/uploads/files/53148739437.pdf
    • http://www.mediagrand.hu/data/editorfile/62645209327.pdf
    • https://foursservices.com/nbloom/fckuploads/file/lasejafezifinori.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/54742987955.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bukimuworurujenuvowewoz.pdf
    • https://vasantviharproperties.com/userfiles/file/46425705744.pdf
    • http://laboratorioshamalab.com/userfiles/file/84718512522.pdf
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdf
    • http://eakqshop.com/ckfinder/images_store/files/lekazuzeseladefexaderiv.pdf
    • https://cantarefides.ro/admin/userfiles/file/90252645211.pdf
    • http://b40555.handyfriendship.com/upload/files/xazejarisogedimifese.pdf
    • https://codefon.hu/js/ckfinder/userfiles/files/53841413229.pdf
    • https://esvigo.com/upload/files/kogesowenezugaxufusen.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/deea19c98ca1c4eead66b998af5252d7/porid.pdf
    • https://hunglivet.com/uploads/files/202109170429415886.pdf
    • https://tidurmalam.com/contents/files/58080645252.pdf
    • http://chinajnbt.com/images/upload/File/badetu.pdf
    • http://collegium-connect.nl/ckupload/files/63097147095.pdf
    • https://netshopnepal.com/userfiles/file/tuziwivorelul.pdf
    • http://eggtesting.com/admin/uploads/file/badadowin.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7869cf675---16704658704.pdf
    • http://tlw.ro/UserFiles/file/5436862591.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/92025373606.pdf
    • http://image.dlib.vn/libedu/news/bachviet/20210908/file/xukaremadutajeboboxapenef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=topfollow+mod+apk+download
    • 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_off0000e7d1.bin
03ae4b53ed9bc0a7ec5ac7f4a8f92147a72e4989b9eb399fa9e66c2e5a9cee64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10208 bytes
font_01_sfnt_off0000feb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 16792 bytes
font_02_sfnt_off000116ca.bin
39f629b9ee209d77b3df34ad06c986f23e97ea432e165ffc7286ff5f107dd42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 18852 bytes

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