Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93a7e32961fb325…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 10:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34b4846a91c0da8d6dfe07815963f40a SHA-1: 4f79b1bc4211d23914126d61ac2ce9ea71a584f1 SHA-256: c93a7e32961fb325c4e397dec97f5a3210cd1ee17b7583b2b6a4464034ebac78
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sistemagestiondpr.com/userfiles/file/vomuxizozeferipezuma.pdf In PDF document text
    • https://thisissati.com/userfiles/files/93339865000.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/3854730833.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-19/20210919165953440420.pdfIn PDF document text
    • http://neteyes.eu/editor_up/71652700862.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/51936860674.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/14623463156.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/56769518242.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/28138370431.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d78ab934682de42f30a89777bebf2429/gizozodaj.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zevip.pdfIn PDF document text
    • http://ausafe.net/images/art/files/1827587847.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/48187983695.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/6703961448.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/16500784473.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/66463868078.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kurusenuzoj.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/84479134457.pdfIn PDF document text
    • https://phukienbep.net/media/files/tojazoponukirezopuvopap.pdfIn PDF document text
    • http://ccadl.com/files/20210912171934.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/78342246283.pdfIn PDF document text
    • http://tochuchoinghi.org/files/79624823171.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/80207331491.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15072525520.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161338907ed4ee---suzosutufugab.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/81662749733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nfc+version+meansPDF 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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 17776 bytes
SHA-256: 5f810a14531c3e14d5426553cbe6daf67b062a55f191a62cd795c0892521900e
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 10396 bytes
SHA-256: b09ba4f333b04f8874198b16e2c875d2ca0f0fcbf31de1f03ab8288201a27f58
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1