Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9ca5214ffd0455…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e717155e6afbe0a324e57347aa470b29 SHA-1: a809c89c0157f5f6873a2af84b0dc664bb9d323e SHA-256: ae9ca5214ffd0455f992eb83c543dc706d9e5c460a88d9b893f1c6ab858ba5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest the document is designed to redirect users to external sites, likely for phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rajhansnursery.com/userfiles/file/32926519073.pdf In PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kevokezojugij.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1410884064.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xoxizuf.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/nusikejad.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/xovivebujifigus.pdfIn PDF document text
    • http://bresky.cz/res/file/43844537078.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/xolisunimelefebugezim.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210916_DDB946A28ABD0276.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/35119180409.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/44605003014.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sasafodadiwipifikuzabaxu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/60996874487.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/sowavuwigijupuwivowifezi.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/71467247234.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wukitaresobivixuzofux.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/sunevanofalilojux.pdfIn PDF document text
    • https://educhina.mn/editor/files/94908399830.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/76394870676.pdfIn PDF document text
    • https://paperland.bg/uploads/file/74673716315.pdfIn PDF document text
    • https://magerp.org/upload/files/24120680067.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/25d64935d4aa0b9f23f283a2bbc06adb/gativorabopijodipifaro.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dcfa2c40180cd908663dd3f9e5a2881d/52396912340.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-1/20210901200047109997.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/53807152400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+sms+programmaticallyPDF 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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 17856 bytes
SHA-256: ce794fa9eac8d5d2a4008b1bfb5e13e8235d3a83c199cb1bab0e02f11328bfd9
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10820 bytes
SHA-256: 27f0c6db7f790d1679d35034dff6009332932c4db0e0330d5098fee10d298975