Malicious PDF — malware analysis report

Static analysis result for SHA-256 775dc7ed453cff6e…

MALICIOUS

PDF

73.5 KB Created: 2021-10-15 20:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a5f46b2171d618afab4d08bc3942054 SHA-1: c5ebc3869080d3172bff8058703adafcbe63ee33 SHA-256: 775dc7ed453cff6eae2a6978d83d87601a6502f6c64839d473c6924c74777594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dangkykinhdoanhkiengiang.com/upload/ck/files/vaxalikawewaguvujux.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efb4ba0c---bolafizimamo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sonazafize.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/46799021868.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/napasumuzido.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/22426318801.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/17003040951.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/mopifegovokuwanezo.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/74505188061.pdfIn PDF document text
    • http://neteyes.eu/editor_up/29735525550.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokofawon.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/28435649190.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/gosujix.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/17722163031.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujomosidon.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wuxuxuseritezotako.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/73240923720.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/57506242492.pdfIn PDF document text
    • http://landia-print.com/pdir/file/15964816710.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vifupitokamevexogorebuk.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/34125264683.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/65471487383.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/zubakuwopafenakuweposexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=martin+luther+king+strength+to+love+pdfPDF 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_off0000bbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE9 16728 bytes
SHA-256: 6987f907a2c8ea253d7a48dc9659d6d7d4d862635b78fc5014c5d91841c8e732
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 11028 bytes
SHA-256: b1be426b93dcbf2b98894841b0cf6dc59388e040a47247008d504d7ae749a821
font_02_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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