Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c195c6512b5b345…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 00:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcb99277ad03ccb2c92c3e9401919fee SHA-1: fbfc2ea94167d5a4324cf9422473123d6311f269 SHA-256: 7c195c6512b5b345fce9281687c86076d4dacf4ffab2e8845f6ea77e15684c54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=wr3d+mod+2k17 PDF link annotation
    • https://siangyun.com/upfiles/editor/files/mofujuw.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87429239038.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_207B2093EA514355.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/dejudakekenedapidala.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/bifasegexufotimamilokozu.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/41966071087.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/67325363370.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/23054743877.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/gutusejuvu.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/84127406628.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/32888222138.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3vbrnfn6slmda4j4670akl1o2u/xotitajirutele.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/mujinitun.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/18260444960.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/85723551558.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/8700425000.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/topajajopozovamel.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b10775c---13685724678.pdfIn PDF document text
    • https://activepymes.com/pub/file/rabepevesofepodavig.pdfIn PDF document text
    • http://ipceurope.be/assets/file/55978866109.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gimukugabodojusutil.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/falefutugibafajadedokon.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/42314235391.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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10088 bytes
SHA-256: e47978a25bc7664da8d1df5525da72938253c54d328ee4dccd6363906b026162
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 17796 bytes
SHA-256: 814f3dd3ad53370058e439b786cd82562ffbebb8ad2b599f378aa10b08c711cf
font_02_sfnt_off00012fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1