Malicious PDF — malware analysis report

Static analysis result for SHA-256 db49370de5961379…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 09:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e17e5876287824b1f5fe5bb61a3c31d8 SHA-1: ae0b66ed400b89e251c2b43225828f0bceb103c9 SHA-256: db49370de5961379a841a63923b5f3945827b59519ea14a5dcd1c19d076b1249
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://schokobrunnen.com/idata/86412706670.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146890366aae---jirogepexowolake.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/rogewiwelogegujiru.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kipokugezuxapi.pdfIn PDF document text
    • http://nenorm.com/files/files/20982613486.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/dutezigigelas.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/974874288.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912173500904385.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/2584262539.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wogivemo.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/22055462345.pdfIn PDF document text
    • https://kaparatt.com/images/File/tikijowenutemezosimopaf.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/golifapivor.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/cccfa13f14e4b1e7f5247a9494668486.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/bisigokimitazusuwegigega.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e279e5c83---49271110911.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/53004470278.pdfIn PDF document text
    • https://viceda.com/userfiles/file/tebedosoxajovumimu.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/biwezetavufaz.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/ranuwalokenarajomikub.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/54696258066.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91887331946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=to+be+present+tense+exercisesPDF 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_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 16444 bytes
SHA-256: d8957f52c8fa834118858fcf1e92971f74026e6e7a05aefad5b1d35b7591a940
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10364 bytes
SHA-256: 2d120e77b8608ad9e8614c9fd8c83a35a69f4f628054f9aa7ac0162e66855b01

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