Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd81ae5db2bb828…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 06:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9855e922a21528b6e692271bded43bbe SHA-1: 05b7a1b824469e6e2d271987ebe3625ee98d3173 SHA-256: 9cd81ae5db2bb8288c5bf216b660e276ddf3af208146e41f8629283f47f4aba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous embedded URLs pointing to various domains, with a high probability of leading to malicious content or phishing sites. The presence of multiple disposable hosts and UTM redirectors further supports a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://londonjip.com/userData/board/file/3503536939.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199235524421.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091908274881.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/bigibu.pdfIn PDF document text
    • http://cataga.de/beta/files/file/wapopubeluroxilada.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/madidekisejenu.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/xasutewogowaz.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/rebegomolasomabutupuxav.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/70247911913.pdfIn PDF document text
    • http://clingac.es/d/files/32640756801.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5a87048---zesusizuvovoli.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/85885853160.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jumisalipizanijoguv.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/9937050944.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/77066810461.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/filukas.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/manuzunonoretorodi.pdfIn PDF document text
    • https://badrivishal.com/media/52188587572.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/zexojipifunalaneril.pdfIn PDF document text
    • https://penzion-palice.cz/content/gakita.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/74822330810.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f066f138a472c7ae6f31c452ed36191b/kugurutibufutafuf.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/titaj.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_043258_159.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/mobobadunazonisigaxebe.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/mepurefijigudejik.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/76039299398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=create+fragment+in+kotlinPDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 17108 bytes
SHA-256: 0439e7d86797a059d760fc026c2493c523e201226b82c7144de98cd0f203a069
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 10512 bytes
SHA-256: 23ac80fec26c2d0e179ef33ffd42facdd83c0840d7c4da7d67fe572be689f961