Malicious PDF — malware analysis report

Static analysis result for SHA-256 0671ea084a57c4e1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 12:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c0d7005ceceadbdbbec5449cdd6b06a SHA-1: a3cded7235fd8ab84ff401d67c768e65ff6ddd88 SHA-256: 0671ea084a57c4e10480580af1392fd7ea55fb56b4d7c1fe971356041d12b712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically flagged it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful sites, likely for phishing or 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 http://yjbiotech.cn/upload/files/tulaseborofobaniwobas.pdf In PDF document text
    • https://amursvoidom.ru/media/files/35514758657.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/37407428674.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/sozefixapusowobumelufunex.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/fesazilu.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/najonigimeli.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xigulevufewulupobuf.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/35065341561.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210916_a6727.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/39069115935.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/13490791014.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/jifodinugutoperisa.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/24546717923.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/bujexuluv.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/18047386717.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/dumazebazopulugijel.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/36067098529.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nomovalarutafiluvu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/82774409341.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/13723966953.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62816947219.pdfIn PDF document text
    • https://laps.pl/userfiles/file/zotetosofoku.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/68575317547.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/11564807777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=floor+plan+maker+onlinePDF 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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 18068 bytes
SHA-256: 339ef8b59fb7166a00f417a1c53880798e1aff5c44b7fddae9cde1110c39b49a
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 10216 bytes
SHA-256: 4dcd3fd7920e6e3178547e4580b51842b233270c2b1839384d519e9e55c2bc63