Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dd378fd94f4a4d…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 14:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70a497f5b7badcbc4b79aa6b014afe3e SHA-1: 9fcdb74c1283fa92f64b2907e19d173665678490 SHA-256: d3dd378fd94f4a4d2fd419a375c2cf94f35d45636d8a2adcc1e555dabcd74d3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm designed to distribute traffic across many disposable hosts. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://bharatiyabhashaparishad.org/ckfinder/userfiles/files/wezubinekikesovibazesofen.pdf In PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/matelenekukunewujeko.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/34287980478.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/13208807359.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/fusibajupekumadelizipap.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774ea96fb2---10835249586.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/11052220212.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wujofezipapowoxapaja.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/30822302265.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/86893e61e5cb72cbd32cd5c141c8f689/68678559824.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/26830146998.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/vazarumurinipesas.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/bedakobuliw.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/pewodupufojetejatilo.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sobotulijoxavezogi.pdfIn PDF document text
    • https://equalland.com/uploads/File/68373816317.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zofidoreleraverop.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/47569932209.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/53293772265.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/74725716638.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/joribaxegubuvajenun.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nofejogol.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/361022804.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/77795056245.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908091255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fisher+and+paykel+fridge+freezer+e402b+manualPDF 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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 11532 bytes
SHA-256: 96cb6046797034e3395eae286f3d305191bc246a024116808c36c52bfa4f3030
font_01_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 18580 bytes
SHA-256: e20f26aa4d0cddda7761676995f54149cb31604d8d6b184844c6817387368b73
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1