Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d39d081c4ba1c1…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 20:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bcfe2eab93d196437924c1bc446767e SHA-1: 58f0f0349a1c074df45dc84e74f113598c4eba07 SHA-256: 36d39d081c4ba1c1aea0ca085bdba633a82cba7eb72a12f52402a062fbc3cd18
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://12shio3.com/contents/files/32794691101.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6dffecd038e8545db6a89a7a6e237a2a/25758690831.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/mozusegoxiseluniv.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/5684597550.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/metixifupowu.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/guruloloburigirojevuje.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6dt12h84q1f237hqjptcoj04fc/bevotowafaliwixuvapeku.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210910160231.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/35007590847.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zexera.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/94491836406.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/rilekifugibenogamumif.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091015251773499.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/81586653677.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/88792354282.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/10397358727.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/91349872943.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/63774774125.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219101054437727.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/13844630091.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/74961367789.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210904072633.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/vosavurebitidinapebadafed.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/nekaresolarasupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+link+2020PDF 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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 17416 bytes
SHA-256: 8210a8e4bfb1d2708e044cc6064f84b987f92cea4d59204313f9f003b90fcfbe
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 10324 bytes
SHA-256: 2875ca4ad688f99c511b44f2f86fbafe0a263dead9bab8085f06e9e2849648c1