Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a51b46a293214f…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 05:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: fafab80af2c3bc173b00fa5902e444a3 SHA-1: a1dadc24331e77422d908210bf626ccc22fd3323 SHA-256: 99a51b46a293214f01a1d5c25c9d73f0837f68eff2efbe725938d5bc73badacd
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://408of53crownstreet.com/assets/media/files/kepadewakumavazowuku.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9cv0ga6bueqc95kuvgufpug212/zapusokosetikoragametoso.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2eea7421a---wuzezesov.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/71656004633.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/33846095987.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/22244466195.pdfIn PDF document text
    • http://yuha.be/_files/file/99533794806.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/87410380547.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/2639900011.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/zaxifukojirusozumewaz.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/menodewimuzapibid.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/34959358198.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/norutalojurobigomudoz.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bakerirurupi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/90670909688.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/dogotuw.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/saduwotuwugefe.pdfIn PDF document text
    • http://abwva.com/uploads/files/22446808957.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/22935920021.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210926235344_9dc1fh.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/nemodaj.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/87567729479.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/7008248684.pdfIn PDF document text
    • http://awards.nl/img/cms/file/13341527890.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/92183144415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+11+pro+max+qr+readerPDF link annotation
    • 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_off0000b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 10504 bytes
SHA-256: 286ef3ee4cfc2eafe51f36514a39abf10c4e84b53b125827ca6b07a060a3c78d
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 19640 bytes
SHA-256: 79a078d5b811e69f2adf19719f83e9f5cfdff276c2a60c906ef52836254b70b1
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1