Malicious PDF — malware analysis report

Static analysis result for SHA-256 1434c8b7eb287b0c…

MALICIOUS

PDF

83.8 KB Created: 2021-10-06 09:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36d53c04d4322467d3a2df88e156ff41 SHA-1: d83ed000680add13e239c62d7ffd21d106e29026 SHA-256: 1434c8b7eb287b0c89a4ac9f58f00e34ef7f1c275bec97b0025067a840a0cc8d
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting. The PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maconlux.lu/userfiles/files/ruridevotet.pdf In PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/23374475547.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/70603524954.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/vewawevusaxu.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/xobajilomedixu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/68666259932.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5654c426---87745972759.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/90595367089.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/86413398340.pdfIn PDF document text
    • https://arendic.cl/files/pujubife.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/8192284171.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/79878463815.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zosakorokovokinal.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tilux.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614401c0be4e6---faminapolubikazaxatelu.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/bamagovugaripu.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xusufidapuxelox.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/95704100579.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/41805896928.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/37768099747.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/jotebebezalumile.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/28908053314.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/29992742618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+long+should+a+college+research+paper+bePDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17768 bytes
SHA-256: a110b84b4a10299bb145ccd9a5c5173297ddb76e77b516ecc8383064920bd111
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 10920 bytes
SHA-256: 4c2a7780a92ed0845382bf8aa8c1154abef19f9de957c4b31b38b4aa28f5e0c4