Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee107cafc5363c6a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 03:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a408c63843b6f6b475c081155240d1a0 SHA-1: a3896db8ffa27be97eb03e96d67fe653e104af6c SHA-256: ee107cafc5363c6ab83f2a5f53f7e58fa592f86d28483fe4ec01c107d1b47904
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=download+moy+7 PDF link annotation
    • http://livestocktool.com/d/files/bozikujebosunosesedivofi.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/45886383879.pdfIn PDF document text
    • https://gameclub.by/uploads/files/41723561016.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061600246268.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vatoxomiwodetazitepok.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/9152351645.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a82fd543526a8e098c38d9657454fdab/zanuwunuderujagirezo.pdfIn PDF document text
    • http://nemalipics.com/49427374393.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2af4d0e9---13946124158.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/golamarubulawizitiwawuzo.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/rujokibevututomopipi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/diwas.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/filavevigofo.pdfIn PDF document text
    • http://cssh.es/img/file/zumusorimulojef.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/gitatulemelilala.pdfIn PDF document text
    • http://chieucoingason.vn/files/67669091405.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/kotoxifezenesuz.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/3221883700.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/vegexawufiwevatowolog.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/mupoxavokulelamixegalawup.pdfIn PDF document text
    • https://onwater.my/uploads/file/rosujejokowa.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78972458644.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/55790045256.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/57454510262.pdfIn PDF document text
    • 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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16880 bytes
SHA-256: 2c3297d2dcd3956d083f9f98099401adecbf24ce31a584fc2410a342d71f89c4
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 10072 bytes
SHA-256: e94d43624961b2a240eeaf4e2d04ddcd1be8e7d37a1925f8784e33e6323b18ee