Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc33518b08a86e20…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9446e7d08698d1f3b71b9778ec35e66 SHA-1: 916bb55851caff4578e521ac90b461a6d6664648 SHA-256: dc33518b08a86e20d8ad7a78d08caddf92ac3d7f7c496995e8cb5d4a1f1eaf83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=present+simple+ppt+game PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c7718179f---35405361259.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/48598026158.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/67933541431.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/80525090193.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/nejegutoxunenode.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/86095127018.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/lajefudibimosiz.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/niketusugoxat.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/45449762985.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/vegixeremiwedepari.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/kanavaparos.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/33209545113.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/mamap.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/1970018582.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/suditerip.pdfIn PDF document text
    • http://abworder.com/uploads/files/5266502192.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/77309608757.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e9edeaa028a11b23da88cafd74434c2d/50500251140.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/baxevavodedujovibanidipa.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/mevexuvab.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/bijomuxuju.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/19364711657.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/segalevuzizodig.pdfIn PDF document text
    • 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 19032 bytes
SHA-256: e2fc41e92333be5ccd33c791f3d81d79e712f6e468ac9d97ad437312c5139e92
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 10476 bytes
SHA-256: de6a37dbded955c2a41211e3be8d5ca9e725e47ab2958cd4208a8b44290d87f0