Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29c6fd32dfdf203…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 18:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 990a5f68fc473bcc6a98772db0a095b8 SHA-1: 065cbbe74972242cf7e34e49a58b7aa97cfc4f4a SHA-256: e29c6fd32dfdf203000848af77ba2722e6378081852a0c52347ea98ac1fe6d86
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across many disposable hosts, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=unpin+live+score+android PDF link annotation
    • https://girisimhaber.com/uploads/file/lizejuko.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/vorokosupumamegobe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/tunolukuduvikekugirenagu.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/kosivoguz.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/53053809605.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/zefegizipal.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/45804737869.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/favaniduw.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910183628401590.pdfIn PDF document text
    • https://aromamarketing.md/img/files/lebarukix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e09e09ab3---validetebadiwipi.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/27578457706.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/zudorupozep.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/mowirowijedubuf.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/7739180549.pdfIn PDF document text
    • http://crm333.com/documentos/file/99122425066.pdfIn PDF document text
    • http://kahasat.cz/data/file/23047183070.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/gopobazafozivazoz.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_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10480 bytes
SHA-256: 8d5080399372031c179f5ec409e38748deaa3a40b339d2b744dcab56bb457548
font_02_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17788 bytes
SHA-256: a43613b3442683395073a223c97e2f0de3553838f81739b759e65ea9f74f42cc

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