Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee42d090c16c033…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 07:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 348a6e68beaf3a8088441008af636cee SHA-1: e8b5ea4ca44cc9794db588fffc3c44834dc42f34 SHA-256: aee42d090c16c03330c8d234933ddf3d924a2db7a0934809c3c28fde79459f43
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially malicious sites for phishing or malware delivery. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://taflanelektronik.com/img/userfiles/file/94716619761.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/80414924999.pdfIn PDF document text
    • http://didula.com/img/file/vunogoguvemaka.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/xewemuworopem.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/vugebikilurozonumokifos.pdfIn PDF document text
    • http://ndt-ultratech.com/files/nujuvozatobikoje.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/biziponilalujemunixebun.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/89032772895.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/bebigowuvidog.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/laporafixanosetud.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/66481864319.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/87868647982.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bekunivarotelafo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a660754fe---56303477018.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/46754857358.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/rukajuxeto.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/jabedivifizafaxofumivux.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/39324706703.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/72473295352.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/wosinelawufule.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53032661003.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/34026509384.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/jojid.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pavopolimon.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/2622364363.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/timipiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=123+movie+mulan+2020PDF 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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 16316 bytes
SHA-256: 4f6eac2d79652eddbf4a974656deee41e4dbac543831c5b61ecffb2dbb1e0ef8
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 10436 bytes
SHA-256: b7aa9237ddcc3d2912b1e9f23281c08cd0c9d309f0aeb2e9f335d0dbc1b80221