Malicious PDF — malware analysis report

Static analysis result for SHA-256 db84fb59d8c7d782…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 11:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e1fec600755ef0361e70a2a666eb761 SHA-1: c9e24a8ef19b6132d5b46e1a178739982845f9e3 SHA-256: db84fb59d8c7d782982b9c7f69ccf518df144c1994a3e58478d693b49f848cb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cicadit.ro/UserFiles/file/1071670904.pdf In PDF document text
    • https://razredna-nastava.net/files/96157160348.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sewiwipisinexijof.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/geperaburokun.pdfIn PDF document text
    • http://bdn10.cz/files/file/lemajozo.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/dobajefejoxanakulijawe.pdfIn PDF document text
    • http://prmakeup.com/Image/files/47939542219.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kikezofopufutavi.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/bozevaned.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/7370780446.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/98461706753.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a34e3c60---70332957415.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-9/20210909191006317719.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/rozokowupugefepigubipi.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fotabesoko.pdfIn PDF document text
    • https://diphong.com/uploads/26008447320.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/dopiwelamu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/47708344771.pdfIn PDF document text
    • https://profesa.net/userFilesfile/72929718176.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/48770560045.pdfIn PDF document text
    • http://iknow.pl/files/file/41345402065.pdfIn PDF document text
    • http://ukrfirework.com/images/file/puzuribe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6c41a8afaf3375ae06cb06fd545dd449/17147176216.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/xagimozalumegilexu.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/95860168300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=custom+rom+samsung+note+8PDF 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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 18348 bytes
SHA-256: c73d2a28ca905b306308fd356b686d8f21b3a4f7555a7eab76cecddb1f8a66da
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 10652 bytes
SHA-256: 64ad2728b3260fd53c4f0261e11ccf68c8d987ad42c2bc4d0c6222398a4efeda