Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ddd2410d8d4b55…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 01:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efa4cd20271f2e4b0e07bcefad035a80 SHA-1: f4dad5eb8e0f6053911f7d2241f56c0634930244 SHA-256: 59ddd2410d8d4b55df71fc3db027d5aefebd30c40c52b6d9f57589a48468f39e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a deceptive purpose. The file's structure and the presence of many distinct hosts hosting PDF files suggest an attempt to manipulate search engine results or distribute malicious content through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://fatename.com/uploads/files/202109061635573617.pdf In PDF document text
    • https://fleschimmo.lu/userfiles/files/vexegabafefeletil.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/62185840042.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/87069845865.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/fasijukidobiba.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/suvitogujaden.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b922a74c92---vojekad.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613db1e79ed9f---siresawese.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/gitezipike.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tunetok.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/gezobojet.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/74686680513.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/molevopukofebilufa.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vitexerikinadedaruga.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/90164906614.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fegivi.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/banukomemukenobupusufam.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/visebirofefilorezewo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/juzupubureligefisagefaj.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/63510540609.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/21607002545.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kelozewukusurikuxuvunezum.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/zalenobetumoguxagaj.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/modivugetixelut.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mibetutisipotej.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/vibolojakutetulolegokuxi.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/levukari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hats+of+thinkingPDF 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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 15032 bytes
SHA-256: 83d1135b3859abe7f9033e25cae81b7049bef3a380516729cd23f3098ebf7483
font_01_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 10296 bytes
SHA-256: 1b783405c0c971ce6717251b3b18fadc132e41c186ff456d3cd3904ba50f05d1