Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dbfbe912b99f39…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 00:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feb4842b0282a2291402736b436a3b80 SHA-1: 1c3207dd4dd53444c4a70b2c6e63870083d0835b SHA-256: b4dbfbe912b99f3922093709202d280489730f00a53a5b15e75f7c744c838264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'configurer+vpn+sur+android' in its query parameters strongly suggest a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=configurer+vpn+sur+android
    • https://ice-group.pl/userfiles/file/rixaf.pdf
    • http://shengyaweb.com/uploadfile/file/2021090315285398.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/wejuxajusinaxizolonipi.pdf
    • https://radekslodkiewicz.pl/files/file/67084942677.pdf
    • http://stensoproject.com/userfiles/files/tijinowogono.pdf
    • http://semanbio.com/upload/files/39471796548.pdf
    • http://taxplus.in/images/contentimages/files/58086245904.pdf
    • http://innovad-ltd.com/userfiles/file/45381896237.pdf
    • https://toscanafantastica.com/userfiles/file/86224797446.pdf
    • http://steelfurniturecn.com/d/files/databiwepesovupovur.pdf
    • http://chiangmai-esc.net/user_img/files/57727655672.pdf
    • http://elsekmont.eu/userfiles/file/3658450705.pdf
    • http://otvorene-srdce.sk/userfiles/file/tukibadebopok.pdf
    • http://eventologia.com/userfiles/files/dewuxerimo.pdf
    • http://chingyi.tw/userfiles/files/54156940075.pdf
    • https://uroci-kursove.com/userfiles/file/losebovusizivarixunakuxe.pdf
    • http://insureavisitor.com/userfiles/file/86950422599.pdf
    • http://irk-yoga.ru/upload/files/dawuz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b94313b8---zogigejevofu.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/60619052551.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/972f95a30f44984cea48f967a2b28558/59429943759.pdf
    • https://southwestlooms.com/admin/userfiles/files/jenufedatokezab.pdf
    • https://hasekei.jp/userfiles/file/mizakas.pdf
    • http://phuwangnam.com/user_file/file/15190362354.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38f.bin
b2f39c7953492a0348c415c5ca949074e174ebd7474370b78bf2563f785c3651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 10728 bytes
font_01_sfnt_off0000fc2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
font_02_sfnt_off0001143f.bin
3deeb9dd5cc1d7690847b66e6cd48cffaa9a1b8735ff07bd652ee39f5809abf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 19044 bytes

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