Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4276225273b2d67…

MALICIOUS

PDF

98.9 KB Created: 2021-10-06 07:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e885c0d5873c7cf12995e08b38d1209 SHA-1: adf1baa475fb66a07682276c7d0772690a431772 SHA-256: e4276225273b2d67ba45a8a02d1a10bb7ba30a375ca57ecaa2be2be5544fc19c
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. It contains numerous embedded URLs, many pointing to potentially disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://liveranigioielli.it/userfiles/files/58315536795.pdf In PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gewutugub.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/56745550317.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/11276278765.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/20690383316.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/zalelunetugisisem.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147108e10374---65830728400.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210927201552736.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/67057127813.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfae55e28---joverabo.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/73936951063.pdfIn PDF document text
    • http://peoplefoster.com/pliki/bosorog.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/93585729939.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/26239904310.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/82980233414.pdfIn PDF document text
    • https://people11people.com/uploads/File/visujegijepisudetapixara.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/9578074197.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/reguzavurinupaxo.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/32942321914.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zuzesufo.pdfIn PDF document text
    • https://medtek.vn/storage/file/87531797940.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/17818330427.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/ragakatejasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stardew+valley+event+guidePDF 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_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 21072 bytes
SHA-256: c982a542e824a1790c840279fcf416dce0639e3bf397fd017de1d48bfd8adbef
font_01_sfnt_off00014db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CE 10576 bytes
SHA-256: 1674ca2c060f18133509c8b7e840d24a2973ffeffc9dfaa2bd5126c3578d8b33