Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e8089f37e95537…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c3bef548c3a7229bef134762f10ccb SHA-1: 94751497da18d1ccb8ab5de57d69f0207042c0ca SHA-256: 49e8089f37e95537a25f1d9b43ada9b3b9d29e6d5485fef92665d369635317c2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous links to disposable domains and the 'link farm' heuristic suggest a scheme to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an exploitation attempt, possibly involving embedded JavaScript, to redirect users to a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://langeline.com/ckeditor/upload/files/fuvinazipewefit.pdf In PDF document text
    • http://grossbuch.com/upload/file/914371425.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sakijizojofidadavetava.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/12692367544.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/54697958684.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/nijukafesepux.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1a745c3---tosiditazejose.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910020835.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/52494666422.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/goperigatugub.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/92794751631.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/paberabositoxunawif.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/babidalupamadufebi.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/4662135345.pdfIn PDF document text
    • http://iscelenie.info/files/file/10032437780.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/jonokatadugonuziwo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/97587625472.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/bebavo.pdfIn PDF document text
    • https://thietbigas.net/media/files/vovipijaxenozuwati.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091322010934.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/lugejafigosexefewegu.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/fufiminifekugevujuju.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/laxezeweni.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161424ec6bee96---54552457597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+add+printer+on+androidPDF 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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 15928 bytes
SHA-256: d5d82663151aefa8db777e1b5dcbc2dc4066a71ef70896d22531fb565479918b
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10248 bytes
SHA-256: e84227541172c170b32feadf49da066a83ebb1a6dc4cf29d5e893d47ba276b02