Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea749c39ae5d6c58…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 14:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a0787eb31ba992f8ee41c290b7c16cd SHA-1: b1dcd42154c697fdb2e3fda05947bf67668c04d5 SHA-256: ea749c39ae5d6c581824d77a1b38a3b1f851f954be5b6940e513ee7e7bc8839c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.
  • 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://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdf In PDF document text
    • https://5703n1n6999-6a55.com/contents/files/16108479766.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/25822891295.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/30771263407.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/giwujus.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906122026228008.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/5703564064.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13844150309.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pizuzinobew.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ha0huadu38b0hs83rj3mivimje/57933759241.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xopesanizudefejiti.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/16438887547.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nizalad.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/komomuwotanadebimisuzepi.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/vinakezofoxexebixu.pdfIn PDF document text
    • http://szjg.hu/images/file/jasukota.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tudavige.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/dutelixiga.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60564752964.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73fe7f333---fuxizoxizufowujogimi.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/70887905121.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/referuvewilir.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/bawaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=deleting+widgets+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_off0000bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 16384 bytes
SHA-256: b7ed69f820c894cd058327619fd8efb9b0618465e1924f10bbd83dfa3ba3e228
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10508 bytes
SHA-256: e8f564da987c3a3981a7ccf2f57ced96464c3170bc6ea2028a8f40a275acf1ee
font_02_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1