Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7db4b2e078cc87…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 10:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf58a04111eccf6f6953ad829f7587b6 SHA-1: f12e8df2bd295029c1d0316cafc00764ad81ea7e SHA-256: 9b7db4b2e078cc87d8765c7393b0e49f83a4d66ba71c3c9089d8cf42a04ce381
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous PDF files hosted on various domains, suggesting an attempt to direct users to download potentially unwanted or malicious content. The presence of a disposable link farm on potentially disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lesrimaudieres.com/images/uploads/file/rokabevolokuv.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/sobole.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/76599761629.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/99848605052.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/52910160979.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/82267718260.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/sawakedulaxulan.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1452337---koviforu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rakozadamivokewu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/64549751012.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/vaxibuvozaviranolo.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/vemeget.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/fixemefizuv.pdfIn PDF document text
    • http://artediapharma.com/upload/files/27534523771.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/67843041658.pdfIn PDF document text
    • http://hla.vn/upload/files/govulu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a452849c---sipirikusedipoxomumivadez.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/mezuwiledupezitedarexa.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/29968663982.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/68032156851.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/sobawup.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/dipesotot.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/visetajatuxuliwi.pdfIn PDF document text
    • http://gugugroup.com/userfiles/33574491010.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=zapya+go+downloadPDF 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_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 17396 bytes
SHA-256: d57e653cd4c0abc529d938ba08861dbe2de824d67fe234826cf2c4145bbc3840
font_01_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 10140 bytes
SHA-256: e02f1a5ac6e8bd54137f4922ae46951befdfadb277845ddd3f2050f3c98a8f0f